Harley Started to Misfire

QuestionMy wife’s 2005 FLHTCUSE2 began to develop problems a few weeks ago.

After a short ride, we stopped for her to get gas. On the way home, her Harley started to misfire and run poorly. I lost sight of her so I pulled over. After about 15 mins she showed up and said her bike would not stay running. At each stop, it would stall but would always start after the fact. It died in the driveway.

We tried to troubleshoot the problem but have been unsuccessful so far. Checked the fuel pump, getting gas, changed the plugs and checked the wires for leaks, no leaks. We then changed the coil with no success. The bike would start at high idle and then slow to a stall. We then did a “wild” code check on the motorcycle and got a code for the Powertrain), P1356-no fire at the rear jug. We fixed the wire at the coil, and tried to start the bike again with the same result. I then did another code check and at P I got a blank screen and then a no rSP- no response?

As you can see, I need help. My wife is a ride-aholoic and I have to live with her and 1 running motorcycle. It gets embarrassing riding on the back of your own motorcycle to keep peace in the house.

– Michael

AnswerNote from the guys:

How do you know that “the fuel pump is getting fuel”? If you were chasing a fuel problem you would want to see what you have for, running fuel pressure.

However, this problem sounds much more like a failing sensor. If you can not pick up any relevant codes on your own, you may need to submit to having a dealer plug in their scanalizer. If it takes them an hour labor time to come up with a definitive diagnosis, it may save you a lot of aggravation.

Check Out These Related Videos for More Information:

Harley Fuel Pump and Filter Removal


Harley Fuel Filter Removal on a Softail or Dyna


Harley Fuel Filter Install on a Softail or Dyna


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193 Responses to “Harley Started to Misfire”
  1. David Zimmerman
    David Zimmerman

    Had the same thing happen to me on my ’07 Electra Glide. Problem was a dirty air filter. Cleaned it (K&N) and all was good. Tip: do not oil the filter.

    Reply
  2. Brad McFadden
    Brad McFadden

    I had a similar problem on my 97 Road King and it turned out to be the EFI temp sensor.

    Reply
    • Rocky
      Rocky

      I have 2007 has no power to y&g wire so no fuel no spark so will turn over no start i have remade a new wire harness and the same thing wont start unless i run a hot wire to fuel fuse (y&g) wire then it fires rite up but starts running rich so its not rite but if i mess with four ground wires i will get power to wire but wont start so is it the ecm or bad ground. Should any ground have twelve volts. Before you ground it i feeling it has something to do with ign or headlamp wires or ground any suggestions

      Reply
  3. Tony Budkowski
    Tony Budkowski

    Sounds like the concern started just after fueling. If so, I would drain the tank and float bowels and start with a fresh known good fuel source. We see it 2 or 3 times a year and usually in batches of 3 or 4 vehicles. If water gets into the supply tank it will go to the bottom. eventually it will build up until the pump starts to suck it out. At first it will suck a fixture of fuel and water so the vehicle will run as described.

    Reply
  4. Dave Beckwith
    Dave Beckwith

    I had an intermittent miss on my ’02 Road King. Would be great for a while and suddenly start cutting out. Found a bad wire on the start relay under the seat. Harley Mechanic said that was probably not the issue but replaced the relay, changed the wire connection and hasn’t missed a beat in two years.

    Reply
    • David
      David

      The wire that you found that was bad on that 2002 road king under your seat… Was that right beside the battery or do they have something to do with a relay near the battery? I have a 2002 CVO road king with a stage three stroker kit installed. When the dealership install the package the bike ran fine for period of time. Now the bike will miss occasionally and cut off at low idol just after a miss occasionally.

      Reply
  5. Dave
    Dave

    I have a 07 Road King and have a similar problem , after a short ride (1/2hr) my bike stalls when not throttled, had remapped on a dyno , plugs …. nothing seems to help , good luck

    Reply
  6. john hinton
    john hinton

    I would think one or more spark plugs is most likely. I have had numerous instances of riders coming into the shop with just this story and although the plugs looked good nothing else checked out bad and a spark plug change corrected the problem immediately.

    Reply
  7. Ray Hurst
    Ray Hurst

    I guess alot of people had the same problem but it was different repairs to fix their bikes. I have a 2002 ultra classic and starting misfiring just like yours. My problem was I had fuel flow but no fuel pressure. I checked the pressure and had only 30 psi. I replaced the fuel filter and regulator (since i was there anyway) and my fuel pressure jumped to 65 psi and problem was fixed.

    Reply
  8. davkd
    davkd

    Mine would do the exact same thing, its a 2007 softail deluxe. It turned out the battery to be the problem. The reason its intermittent is the bike will start running weird in other words it would take a charge but if for some reason that charge did not hold for long the bike will start running weird again. So I went and change the battery and I’ve never had the problem since. Check your cranking amps voltage and then you’ll see clearly if it is in fact the battery that is the problem. This is the last thing I thought it would be myself as well, but then you are fuel injected now too correct? They need proper voltage to operate correct. Hope this helps.
    Dave

    Reply
  9. Mike Kemp
    Mike Kemp

    I had this issue on my 2006 Heritage, and it was that the double-sided tape that holds ignition had come undon underneath the console. It was shorting out. Once I re-attached it it was good to go with no more issues.

    Reply
  10. Len
    Len

    Yes. Sometimes with issues like this we have no choice but to bring our baby to the doctor. These bikes are so much more complicated than they used to be before fuel injection and all the sensors and senders that go along with it. We not only need special tools to point us in the right direction, but more so the real knowledge of the systems. Even factory trained tech’s at the dealer get lost on these type of problems. Best to just bite the bullet this time

    Reply
  11. Bill Cheney
    Bill Cheney

    To me the clue in what the problem might be is that she had just gassed up her bike. Either drain the fuel tank and refill with clean fuel or add some isopropyl type dry gas and that should take care of the problem.

    Reply
  12. RON
    RON

    MY 2010 ELEC. GLIDE ULTRA FLHCUI WILL NOT START ON FIRST TURN USUALLY HALF TURN AFTER STOPPING FOR FUEL OR SHORT STOP WITH ENGINE WARM. IT IS PERIODIC SO NOT CONSISTENT. I HAVEN’T CHANGED MY FUEL FILTER FOR 32,500 MILES. I HAVE IT SCHEDULED NEXT SERVICE: JUST WONDERING HOW MUCH THIS FILTER COULD CONTRIBUTE TO ISSUES?

    Reply
    • Dennis Santopietro
      Dennis Santopietro

      Hi Ron, If the filter is dirty and is pulling the last fuel out of the tank before refilling it could be an issue.

      Reply
  13. Marty Johnston
    Marty Johnston

    Being the problem started after your wife stopped for gas, I would drain the tank and add fresh gas! I had this problem, and found the problem was contaminated gas(to much ethanol)!!!!!

    Reply
  14. david
    david

    Hi. Did the bike start running bad after filling it up? If so…smell the gas. The gas nowadays goes bad quicker than ever. If you run premium fuel, not alot of people run it anymore because of the price. Premium fuel sits longer in the gas station tanks. If it smells funky, relpace the fuel and go from there. Im a 15 year factory trained tech and i always start with the simplest thing first, you would be suprised.

    Dave

    Reply
  15. donald harrison
    donald harrison

    well now that iv got the problem now Iv got 89,000 miles on my 04 ultra classic all your comments all valied response I thought i would break into my cam chest cavitiy and replace my camtension shoes maybe that will take care of missing engine fire and at that many mile im sure its due now while im at it might as well put in my 203 se cams then check the engine temp sensor Iv already did most of the comments but since out riding season warm garage why not and oh not read the most important book service manual wish me luck….. thanks

    Reply
  16. Len
    Len

    It’s really tough to almost impossible to troubleshoot a running probelm like this through a forum like this. We all do our best to work on our own bikes but sometimes have to bite the bullet and let the dealer put their hands on our babies

    Reply
  17. Robert Barnes
    Robert Barnes

    I have a 2002 carbureted Heritage Softail. It won’t start. Checked fire at plugs with a test plug and got no fire at all. Battery is hot and it will spin over briskly, but won’t crank. The last time I ran it, it developed and miss and a spit back and sounded like it was running only on one cylinder. Tried to let it run to warm up and went dead. No crank after that and no fire. I check the main circuit breaker under battery box and it checks good. Not sure where to go from here. Any suggestions?

    Reply
    • Dennis Santopietro
      Dennis Santopietro

      Not sure what you mean by: “battery hot” but the battery should never feel hot.
      If it was possible, at this time, to start your m/c; the 1st thing we would suggest is to test your charging system.
      Be sure you are starting with a, known, good battery. Anything older than 4 or 5 years old may show 12 volts, but lack sufficient amperage. Use a volt meter to test for 12 volts at your ignition coil. If you have no voltage there, you will need to see if you are getting proper voltage to/from your start and run switches. Check your ignition fuse. If it is blown, you have a dead short somewhere in your ignition system’s path. Check your speedo for DTC’s. Your problem may be caused by a bad crank position sensor. Or you may have a code that points to your ECM or turn signal security module.

      Reply
    • Eric Evans
      Eric Evans

      Check your crank senso I was taking a safety course and bike diied. Used jumper wire to see the number of engine flashes for codes turned out to be crank sensor. I had no spark at the plugs.

      Reply
  18. don richard
    don richard

    I had the same problem with my 04 fxstsi. It ended up being leaks in the fuel lines inside the tank. This caused low pressure in the lines plus when the fuel level was low the fuel lines were sucking air and the engine would die.

    Reply
  19. Jeremy
    Jeremy

    I had the same problem with my 883 sportster it turns out I got bad gas from somewhere that had water in it I had to completely drain my fuel system and make sure everything was flushed out good and get new gas in it after that it ran fine i’m not saying that’s what your problem is but it could be a possibility if you never drained out your fuel system and tried to put new fuel in it you have to watch where you buy your gas sometimes you get water in it hope I could help

    Reply
  20. native
    native

    rear jug misfire and it keeps fouling my plug 1991 sportster I took it to the local Harley shop and they took me for 900 dollars no fix ive changed plugs wire coil ignition do I have to rebuild the engine?

    Reply
    • Customer Service Techs
      Customer Service Techs

      First thing you should check is your charging system. A bad charging system can make a bike misfire, or just run really bad.
      http://www.fixmyhog.com/video/charging-system-diagnosis-002187/

      If the ignition system is all complete and known good; you can isolate it from the rest of your wiring harness to see if you have a problem within your wiring harness. Remove the +12V wire that powers your coil. This wire is usually white, or white with a black tracer. Make a good jumper wire and run it from the positive battery terminal to the coil post, where you removed the white +12V wire.
      Make this jumper so that you can quickly/easily unplug it when you need to kill the ignition (you will not be able to turn off m/c until the wire is disconnected). If this solves the problem, you need to search for a dead short within your wiring harness.
      If your charging system tests good, your ignition system is new and tests good and you still have this problem after isolating the ignition system; unfortunately, you may be looking at a mechanical problem.

      Reply
  21. Stephen
    Stephen

    I have an 2007 FLSTC 96ci , I had same issue after fueling, it started to sputter 30 minutes after filling. Does the same thing as your wife’s FLSTC. I changed plugs, still the same. I cleaned air filter, still the same. I tried puter diagnose, CODE P0131 which is O2 front sensor, called Harley and asked ” if I disconnect the O2 front sensor, will it still run?” Harley said ” yes but it will throw code” . Once again disconnected the O2 front sensor( seems to me I should be able to remove too, people do run straight pipes on same motor!), did the same again, misfire. Charged the battery, same again, misfire. My last resort now is change the fuel, maybe this will work. [(I have 37,000 miles on my 2007 FLSTC,just read another blog that the Harley twin cam is manufactured with plastic pieces on the gears!! Harley does not recognize this
    failure as factory recall. Only solution change to straight gear set up. ..but first I will change fuel. (Just a friendly heads up, as Harley does not recognize this failure as their own!)]

    Reply
  22. Mike
    Mike

    I have a 2005 Harley sportster 1200 FC custom driving down the highway today and 70 miles an hour all of a sudden the drop-down about 10 miles an hour and it felt as if I lost a bunch of power when it stop it stays running and it fires up if he shut it off however the back jug doesn’t seem to be getting full power I don’t think it’s fuel because I think it may be electrical wires coil does anybody have any suggestions please if you do email me at Mike mascaro@hotmail.com it would be greatly appreciated thanks brother’s

    Reply
    • Customer Service Techs
      Customer Service Techs

      Hi Mike. Do a compression test. Front & rear cylinders must be within 10% of each other.

      Reply
  23. Frank
    Frank

    Wow I read all this stuff and watched the video on how to change the fuel pump and filter. My 2008 Dyna Glide would start and I would get a little ways down the road, five or six blocks and it started stalling out. It was hard getting it to run long enough to get home. A friend of mine came by (who claims to be an expert) came over and he was spitting out suggestions real fast. Well I didn’t want to look dumb so when we had it going a little I reached over and took the gas cap off. He had just got through telling me that wouldn’t help none when she smoothed right out. He couldn’t believe it. He revved her up to about 4000 RPM and held till the air coming out the tailpipe was pretty hot. We tried it five or six times during the next hour or so and we couldn’t get it to mess up again. The gas was real low in the tank 1/8 th or less according to the gauge then I added gas before we got it going good. I noticed condensation all over the bike so I wonder if it just built up too much condensation in the tank when it got real cold and warmed up again and just had too much in the tank before I added gas. I am going to keep the tank full during the winter I guess.

    Reply
  24. Spoons
    Spoons

    friend has a 2003 883 that’s sat for a few years now it won’t idle cleaned out the tank of all the bad gas and put new in it but still doesn’t stay idling when out push the choke all the way in but it runs as long as its pulled out

    Reply
  25. jesse stackhouse
    jesse stackhouse

    2005 sporty that wasn’t started for 5-6yrs with a full tank of gas. Removed tank and had it recoated. Got it to start and idle with choke on , but it wont run without choke and it pops out the carb when you crack the throttle.

    Reply
  26. james
    james

    hi! i just put together a new top end for 1988 sportster with nhrs stage 2 thunderstorm heads and new pistons/cylinder work by nhrs…i’ve completed the “heat cycles” and took her for her first easy mile ride…i’m using a mikuni hsr 42 carb and cycle shack 2 into 2 pipes…running compu-fire 21850 selectable electronic advance ignition…static timed it…my prob is the rear cylinder is miss-firing…everything checks out…no intake manifold leaks or exhaust leaks…rear cylinder feels cooler than the front cylinder…timing?? carb?? i can’t figure it out…thanx!! -james.

    Reply
  27. Curtis
    Curtis

    I have a 91 Harley FXSTC. It’s dying while I’m riding it likes it’s running out of gas. I’ve replaced the intank fuel filter, the fuel cock, and rebuilt the carburetor and still have the problem. The bike starts and idles good but when riding it down the street it shuts off and then kicks back on. Could this be an electrical problem or is this definitely a fuel problem?

    Reply
  28. Joseph Rajasingh
    Joseph Rajasingh

    Hi , I would like to join your group , as i would need help from all of you to fix Harleys in Bangalore India

    Reply
  29. Ken Price
    Ken Price

    2000 HD FatBoy, carbureted, stock, 50K miles. If I get on it (coming down a ramp to the interstate) it will start cutting out at 60mph. If I slow down below 60 it runs fine. If I speed back up it will start cutting out at 60 again.
    If it is sitting still and I rev the engine up, it runs fine until I get to the RPM that would have been 60 MPH. Am I starving the carburetor, fuel pressure, timing? After sitting for a while, it runs great – even above 60MPH. This seems to be an intermittent problem. But, if I get on it again, I have the same problem.

    Reply
  30. Bruce Daniels
    Bruce Daniels

    I have a 98 road king that’s driven me crazy. Not sure if my two problems could be caused by same issue. When I bought my scooter everything seemed to be fine. Then one day wile running down the road at a steady speed no problems, till I roll my throttle back and its like she falls on er face. If I ease off it no problems she runs steady. This may happen once or many times in a row then she will run like a scalded ape. Can roll my throttle back and there is no hesitation. This may happen 2-3 times a day,week or may go a cpl months no problem . Other times when I come to a stop it will try to blow its self up idling sky high. I have to ease out on clutch to pull er down till light changes. then at the next light pull clutch in and no problem at all. Never throws a code while acting up. Now its a crap shoot to go ride. Ill go out and hit starter it might bust off no problem or it will just turn over not getting fire. Go back in the house try again later again we may ride no problems or we may not just depends. Again is not throwing codes. When shes running shes good. Just never know if its goona start or not. How can I figure out if it wont act up and throw a code when I take it in to get fixed? Im told they cant find nothing wrong. Just never know when she’ll decide to get moody and not cooperate. or if she’ll run like there is no issues what so ever. The last time I had it looked at it wouldn’t start for a day or two . Then all the sudden boom shes ready to roll, no problems at all. Thanks

    Reply
  31. guy
    guy

    Loss of Idle Sped Control EFI code p0505, just started running rough wont idle,backfires on hard accell.dies at stops.i just replaced positive cable for my battery tender and then this started. any suggestions?

    Reply
    • Customer Service Techs
      Customer Service Techs

      Hi, Guy! Can you please tell us the make/year of your bike?

      Reply
  32. Robert
    Robert

    I have an ’04 ultra. After it warms up it backfires and dies. Changed the fuel filter, then the pump. Works a little better but does the same thing. At idle after it warms up it wants to die or when I’m changing gears. Have to give it a lot of throttle to keep it running then it smooths out again. Any suggestions

    Reply
  33. Lee
    Lee

    I have a 2008 1200 sportser with a first stage screaming eagle kit my rear cyl started missing and I tried every thing to fix it I have changed plugs,wiring, injectors,coil and tried inj cleaner performed resistance test on wiring and checked wiring for any damage the battery is good we even checked the spark and we videoed it and we noticed in slow mow that the rear spark was erratic it has been to the Harley shop and on the dyno and they can`t figure it out can any body please help I`m going nut`s here

    Reply
    • LEE
      LEE

      I have no codes coming up at all I had asked Harley and other people if it might be the ecm but they said no when a ecm go`s it go`s I think I will try it because I made a jumper from the ecm to the coil and it didnt work either so the wires are good.

      Reply
  34. Ashley
    Ashley

    We have a 2008 Harley Davidson sportier nightster edition we have changed the fuel pump the map sensor the plugs blew out the injectors but still sounds like it’s not getting enough gas we have took the breather off to see if it would run better it will crank but not stay running ??? Anyone know what the problem might be we have looked up everything called everyone and nothing. We have clean the gas tank put new gas in it if anyone knows could you please help ????

    Reply
  35. Bruce Carpenter
    Bruce Carpenter

    2005 FXDC Carbureted, Stage 1, Screaming Eagle exhaust, No motor work / stock. Acted like misfire since day one and also spit / backfired trough carb. So chased carb problem first. Picked up re-jet kit from HD and installed slide spring, emulsifier tube, jets 48 and 185. Drilled out air mixture and installed adjustable needle. Set needle 3 1/2 turns out from seated. Reinstalled carb and started bike. Got up to running temp and adjusted air mixture out to 3 3 /4 for final best smooth idle. Blows black puff out pipes on acceleration. Harley said go back to 45 jet. Now popping back out through carb so I found a 46 jet and this seemed to relieve this problem. Now only pops out carb after a long idle when rolling throttle or after running down highway and stopping at and exit then accelerating after stopping. Now to the misfire. Front plug white, rear plug black dry soot. At idle you hear it drop / miss about every ten seconds. At highway or any steady speed for that matter you can hear it drop off about the same ten seconds. During acceleration it pulls hard and strong. Deceleration you get the typical back rumble with a dead sounding thud in there. My Harley shop didn’t find anything during my maintenance plan when I complained. Never mentioned anything about codes. I’ve changed plugs about 2x per year. Platinum’s didn’t help. Changed wires and same thing. Sprayed carb cleaner around intake etc… and no change in idle. So now what I guess? Oh yeah, this twin cam is about the noisiest damn motor I have had and compared to others around it. Always since day one, sounded noisy like a loud ticking lifter or valve train. Way noisier than my ’90 EVO with 50k and my ’89 Sporty with 39k. This Twin cam only has 18k. Harley said some are noisier than others. Any ideas so I don’t just start part swapping? Thanks

    Reply
    • littlebazz
      littlebazz

      The twin cams uses rocker hold down bolts that are smaller in diameter than the cutout lock on the rocker shaft. This is what makes the ticking noise at 2000-3000 rpm. The shaft rocks back and forth against the bolt shank. There is a bushing kit to repair this problem {if you don’t want to live with it}. Its called rocker lock. Dealers that are familiar with this can do the installation in 3 hours.

      Reply
  36. Mike
    Mike

    I have a RevTech custom I developed a miss fire on the #1 cylinder. It’s only running on the #2. I have replaced the ignition switch,cdi,stator , elec. ignition and plugs an wires I have even gone through all the wiring looking for a short somewhere and have not found one my Bro and I are at a loss. Any ideas? Thanks

    Reply
    • Customer Service
      Customer Service

      Hi, Mike. We would be happy to assist you; we just need some more information. What is the make/model/year of your motorcycle?

      Reply
  37. David keeble jr
    David keeble jr

    2012 Harley sportster misfiring I changed the spirit plugs and plugins and coil pack and still misfiring.

    Reply
  38. sonny
    sonny

    ve an 06 883. Sometimes I turn the key on and nouthing works but neutral light.the Speedo stoped completely about 3 months ago nouthing on it no lights miles or the hand. I pulled every connection apart and put electric grease on them tighten all battery cables no luck. I was talking to someone and they said many the ecm. I looked this thing up but I can’t find out what it dose or what it controls also something about a replay and a circuit breaker. Please help

    Reply
  39. Joseph
    Joseph

    I have a 2013 street glide. I was riding the other day for about 2 hours when the bike quit. Pulled off air filter and the bike ran fine. Put a stage one filter kit and changed the plugs, still having the same problem. Added a fuelpack and still doing the same thing. Any thoughts out there ?

    Reply
  40. Elias
    Elias

    I have a 2008 street glide. It turns on but it only goes 20 mph does not go any faster change gears and nothing changes. Any suggestions

    Reply
  41. Steve j
    Steve j

    Have a2001 Fatboy carbureted. It dropps the front cylinder, changed plugs and wires, changed coil and all was fine. Ran good for a month, drove to work today, ran fine, after work was back to the rear cylinder only firing. Now what????

    Reply
    • Customer Service
      Customer Service

      Hi Steve. Need to verify weather or not you have spark @ the front cylinder.
      If you dont, and you already replaced coil, plug wires & plugs; you may have a bad ignition module.
      If, however, you have spark but the front plug is fouled out; your issue is not electrical
      http://www.fixmyhog.com/posts/harley-tips/

      Reply
      • Charles Lennix
        Charles Lennix

        ok Steve I will check it out when i get off from work in a lil while. the bike was running fine and all of sudden i started running real bad. I had to get the trailer to take it home

        Reply
  42. Charles Lennix
    Charles Lennix

    my 2005 15th yr anniversary fatboy is losing power,decelerating,and misfiring. I can’t figure out what’s wrong.I need help please!!!!!

    Reply
  43. john
    john

    Have a 1972 sporter with a new rebuild and can’t get it to start it has spark and getting gas it’s popping trough the carb and spitting fire out the pipes but that’s it iam stumped could you please give me some ideas of what could be wrong

    Reply
  44. Dan Piper
    Dan Piper

    I have an 87 Electra glide classic with 15000 miles, the other day it started to miss after about 6 or 7 miles and I can’t figure it out. Any ideas would greatly appreciated

    Reply
  45. Doug Mullins
    Doug Mullins

    I have a 1996 Flhtcu 80 cubic inche. Was riding and key switch turned off. Turned back on back fired a few times then running on front cylinder! Replaced electronic ignitiontransmission timing all is good ! The problem now is mising & poping @3200 or so Rpm ? Acceleration is good up to that point ?

    Reply
  46. leslie
    leslie

    2003 heritage softail has been having intermittent starting problems. Last week I stopped and when I went to restart the bike the lights came on but hitting the switch I got ZERO. I sat for 15 minutes and it started up fine. Happened again the other day but after an hour it didn’t restart so I had to get towed. I replaed the starter relay as my mechanic said it would be the easiest fix. Next day fired up fine again so I took it for a little spin to town, stopped got gas, started right up, stopped at hardware store, started right up. Pulled in the driveway, she stalled and once again nothing . This morning started up again. Grrr The starter is a rebuilt and a year old. Wondering if it could be that or the solenoid or perhaps something in the circuit. Battery is under a year old

    Reply
  47. Michael
    Michael

    I just got a 2006 road king custom and while riding the check engine light would come on and then go out. I did retrieve code p1356 (rear cyclinder no combustion) It doesn’t cause bike to stall but I’m concerned about doing a long run, what should I be looking for???

    Reply
  48. Jake Kibler
    Jake Kibler

    2013 Fatboy Lo having what seems like a compression problem. Upon startup, it sounds as if one of the cylinders is not firing and I am not getting a full cycle upon start. After this happens and the bike is running, as soon as I come to a stop or decelerate, the bike idles low then cuts off. My first thought would be spark plugs (and as soon as I have free time, I will check them). If the plugs check out, are there any other ideas that I can contemplate in the mean time?

    Reply
  49. John Hogate
    John Hogate

    my son in laws 2002 soft tail has almost always been a little hard to start! but now it is also cutting out!
    I helped him check the spark yesterday (40 years ago I used to be a pretty good mechanic)
    anyway while turning the engine over with the plugs hooked up to the wires! but out of the cylindes! sometimes it could take up to 6 seconds before they would start firing, same with trying new plugs, and just the wires!
    I am pretty sure the coil is alright, because when just checking the wires1 It will throw a blue flame a good
    inch away to ground.
    to 6 seconds before they would start to spark

    Reply
  50. Dan
    Dan

    I have a 2002 road king fuel is dumping into back cylinder plugs are good plug wires are good for the injector be bad or the ECM

    Reply
  51. Harley Beranek
    Harley Beranek

    I got a prob with my 92 883 relay from the positive terminal overheating and shuts the bike down, not sure if it means the relay is bad or the wire is too small any ideas?

    Reply
  52. Vincent
    Vincent

    Had the same thing happen to me on my carburetored 2003 DWG. After checking gas, fuel filter, air filter, spark plugs, battery, coil, etc. etc. found the problem to be a faulty gas cap . . . Gas cap has a built in venting system which allows air in but not out. My gas cap, over time became “gummed up” and would not allow air to come into tank thereby causing a vacuum of sorts which obstructed the flow of gas to the carburetor. Easy fix: either replace the cap or tank it off the bike turn upside down and clean it / with degreaser or other detergent. Dry out with hair dryer and place it over your mouth and suck on it, if air can sucked in you are good to go, if not just replace the gas cap with a new “vented” cap for your model bike.

    Reply
  53. Mary
    Mary

    I have a 2006 Fat Boy that has been intermittently missing at Interstate speed (80 mph) for the past year. I have ensured the battery cables are tight. I replaced the spark plugs and wires, air filter, coil, clutch and clutch position sensor. I took it into the HD dealership, but it is not throwing any codes. What suggestions do you have to resolve the issue?

    Reply
  54. jeff Thacker
    jeff Thacker

    95 ultraclassic eletcraglide firing on one cylinder. Dealership said it was in the wiring. New coil need help

    Reply
  55. David
    David

    after 25 miles to work stalled my 05 sportster 883C at the check point at work and afterwards it has a hesitation like a fuel filter but runs, when u apply clutch it dies, run rough at idle.

    Reply
  56. Wade Nicholson
    Wade Nicholson

    Please help. 94 softtaill backfired after rolling it out of storage. Now it pops and backfires and I try to start it. I suspect that the timing has jumped and I am on the road side trying to get it to a shop. Very hard cranking. Fuel is fresh. Any suggestions to get it running?

    Reply
    • Customer Service
      Customer Service

      Hi Wade. Timing will not change.
      Most common reason for backfire on your year & model is a bad charging system. Start with a full charging system test.
      https://www.fixmyhog.com/video/charging-system-diagnosis-002187/
      Another possibility is a bad ignition.
      If the charging system checks out ok, and you have strong spark, your issue is fuel related.
      Make sure that you are using a fully charged, quality, known good, battery.

      Reply
  57. KIMMIE
    KIMMIE

    MY 2009 ROAD GLIDE (UPGRADED TO A 103) ALL OF A SUDDEN IS ACTING LIKE ITS GETTING TOO MUCH GAS, MAKES A SORTA WINDING SOUND AND JERKS LIKE ITS NOT GETTING ENOUGH FUEL OR TOO MUCH FUEL. JUST CHANGED THE PLUGS, INSTALLED THE 10MM SPARK PLUG WIRES NOT DOING IT AS BAD, WAS DOING IT WHEN I WAS EXCELLERATING AT ABOUT 3 GRAND NOW I CAN JUST BE ROLLING SMOOTHLY AND ITLL START DOING THIS NEW THING ITS DOING. SORTA UNCOMFORTABLE FEELING, ANY IDEAS? FUEL INJECTORS DIRTY? TUNER FOULING? BAD GAS? DONT KNOW HOW TO TROUBLE SHOOT THIS DONT HAVE ANYONE TO RIDE IT AND TELL ME WHAT THE HELL IS GOING ON EITHER.

    Reply
    • Customer Service
      Customer Service

      Hi Kimmie. First, you need to determine if your issue is electrical or fuel related.
      If you have a Power Commander or Vance and Hines FP3, make sure the tune/map is correct.
      Verify that you do not have an intake leak.
      https://www.fixmyhog.com/video/twin-cam-harley-intake-seals-replacement-008713/
      Check for possible Diagnostic Trouble Codes that might lead you in the right direction.
      https://www.fixmyhog.com/video/troubleshoot-with-harley-error-codes-008010/

      Reply
      • Kimmie
        Kimmie

        Hi Customer Service. Im really not so sure how this website works, but I want to say thank you for your feedback. I road a 1970 Shovelhead for years, and a 1992 Ultra (Evo) a 2003 Electra Glide and now this disco’d out rolling computer… I hear my Dad (recently passed and riding partner for life) I hear my Dad helping me trouble shot this the best I can, fuel, ignition, computer, so I did what I could before taking it to the dealer, changed the spark plugs, put in new Screamin’ Eagles, I even upgraded the spark plug wires and although a pain in the big phat ass I have, changed the sparkplug wires to the 10mm ones , nothing, fuel injector cleaner nothing, couldnt find my thumbdrive for my master tuner, have an appt. at RC Cycles, 1200.00 from now, so I took it to harley, its there as I type this, and Im flat trippin, because they are telling me that it is the Transmission??? Jumping?? What the??? How the?? how can what Im describing be the transmission, i cant wrap my mind around it, and 6 hours of them taring it down just to “see” at 125.00 bucks an hour on my single white trash budget just makes me naushis… terrible speller, any clue as to why the transmission??? jumping third gear ??? I dont know im so depressed it isnt even funny. i hate driving cars, and especially my little 3 cylinder rolling with four different tires and no a/c in 96degree weather, (I have well over 50,000 in to my Glide, my bike is my Pride and Joy…. sorta sucks when your Dad parts and there goes your ace in the hole…. any clue about the tranny im a sponge ready to learn

        Reply
  58. monty
    monty

    1988 Harley FLHTP. Runs great with ignition on only. When the switch is turned for lights a miss developed. Tried new 32 amp rectifier and white wire to coil. Still misses. This bike has 4 breakers behind the headlight. Could a breaker be the problem. I’ve checked wires throughout the bike and cannot find a short. What about the ignition module and sensor plate? Bike has 25,000 miles on it and developed this problem all at once!

    Reply
    • Customer Service
      Customer Service

      Hi Monty. If the bike runs fine with the lights off, you have already narrowed things down.
      You should be able to rule out a bad ignition and charging system.
      However, would still perform a full charging system test.
      https://www.fixmyhog.com/video/charging-system-diagnosis-002187/
      You could have a bad ignition switch or a dead short.
      Use your test light to determine which breakers are powered on “2 clicks”.
      Then, remove one wire at a time until you find the culprit.
      https://www.fixmyhog.com/videos/electrical/
      Make sure that you are using a fully charged, known good battery and that your battery cables are clean and secure.

      Reply
  59. David
    David

    2006 Deuce will misfire while at level speed or going down hill. as long as gas is being applied not a problem.

    Reply
  60. Tom Bowne
    Tom Bowne

    2003 Road King Classic, I have a few issues when its cold my fullie acts like a carb that has not been chocked and bogs down until warm then runs great, and it was having a intermittent miss fire until I coming back from Minneapolis and when going down hill and backing off throttle would have bike bog and when getting on throttle it would sputter then run great as long as I was on throttle? I have had it in before and no one has come up with a solution. Advice so far Throttle Control Mogul, Fuel Filter, Fuel Pump, Temp Sensor. I run Sea Foam in it and it is always on a battery tender.

    Reply
  61. Kelly
    Kelly

    I have a 2007 heritage softtail it start and runs for a minute or two and then dies but starts right back up can u help me with what wrong or thing to look at

    Reply
  62. jasen
    jasen

    the problem I have with my 2006 Harley 883 sportster is that when the engine is cold it runs great. But when the engine gets hot I lose power. Example when go over an over pass at 45 mph I start to lose power and it drops to 35 mph but the engine rpm runs high. I give more throttle and shift gears and it feels like I’m in 2nd gear when I’m 4th gear and that’s also whats it like when i pull off at a stop light. How do i fix this without taking it to the shop

    Reply
  63. joshua huskey
    joshua huskey

    I have an 02 Heritage Springer. I got it after it had been sitting for about a decade…I started to have intermittent fuel delivery delivery issues (slowing to shutting down at idle, unable to stay running at idle or even feathering the throttle at lights) temporarily, topping off the fuel would work, I noticed shining a flashlight into the tank, that there was tank liner pieces loose in the bottom of the tank. It finally resulting in running one the front jug only ( I assume some of that shit has clogged a jet), I haven’t fixed it yet, I was reading the forum to see tips and suggestions. Thought I’d put my two cents in as I haven’t seen that suggestion yet.

    Reply
  64. Bruce
    Bruce

    My ’89 Electra Glide has been running rough when in the lower gears with a light load on the engine. Yesterday, half way through the ride it started backfiring and sputtering. Thought I was going to be walking. It also got extremely hot, so much so, that oil smells burnt and is black (200 miles sense the last oil change. Cleaned the tank, new fuel line and a carb tune-up less than 100 miles ago. New spark plugs and wires.

    Reply
  65. peter
    peter

    (2000 fatboy carburettor) When i try to start it, fuel just pours out of the air filter, it is coming out of the top left hole on the carby facing the air filter. the vacuum diaghram is damaged right on the outside edge. Although it doesnt appear to be damaged on the inside of the diaphram i suspect this is the problem.
    Also is the diaphram replacable or do you need to buy the whole piston/diaphram? Thanks

    Reply
    • Customer Service
      Customer Service

      Hi Peter. If your vacuum diaphragm is pinched in any way it will need to be replaced.
      Believe that you can purchase the diaphragm, rubber only, from V Twin, rather than the whole assembly.
      Your needle valve may be stuck open.
      Suggest removing carburetor for a thorough cleaning/inspection/rebuild.
      https://www.fixmyhog.com/video/harley-carburetor-rebuild-007192/
      Should also replace intake seals at this time.
      Thanks
      Mark-FMH

      Reply
  66. Jared
    Jared

    I was out of town when my original spark plug wires got a burnt so I had to put other wires on and it ran really rough, got to my town and got new wires from harley, now it starts for one second and dies, checked plugs and cleaned them, took air cleaner off and sprayed with wd40, it is getting gas, but only staying alive for a second. It’s a 1996 superglide fxd. It ran fine before all of this

    Reply
  67. Brian Culp
    Brian Culp

    My 06 soft tail started missing and running rough. Had just gotten gas about 15 miles before it started acting up. Drained the gas, new plugs and new ignition coil. Still have the problem. Air filter is only 3 months old. I thinking injector or burnt valve. Sounds like the front cylinder.

    Reply
  68. Ed
    Ed

    I just bought a 2008 Fatboy. It starts fine and idles fine, but when driving it runs rough. It accelerates fine it just don’t like to run at a steady speed.

    Reply
  69. Leland
    Leland

    I have a problem with my 04 fatboy firing on the back cylinder only new wires and plugs, I need help.

    Reply
  70. chip
    chip

    I have a 011 softtail and when riding and I start to slow down to a stop as I’m down shifting to 1st. the idle will slow down and then stall. I have to try to pull over and go into neutral to start the flsct up again this happens a few time then she runs good after that, what is the solution? fuel pump? bad filter? bad gas? any suggestions please send on to me

    thank you
    chip

    Reply
  71. C Dennis
    C Dennis

    I have a 99 sporster with an 03 1200cc motor off another sporster. When Ihit the high end of each gear the bike wants tospit and sputter then occasionally backfire. When I hit crusing highway speed it’ll do the same thing. Any ideas

    Reply
  72. Russell Lee Wantz
    Russell Lee Wantz

    My 2004 ultra classic engine light comes on the code is p0261 but the bike runs fine no notice of it running different

    Reply
  73. Reed smith
    Reed smith

    NB Ticket 17101 my 2001 Ultra Classic was going down the road went on and off on and off and then quit when I pulled the seat off the positive cable was loose when I tightened it up the lights came back on but would not start now it has no fire don’t know if it’s getting gas or not

    Reply
  74. Perry
    Perry

    NB Ticket 17079 I have a 2008 Street Glide and for some reason I seem to get the 1356 or 1365 code for no fire to the rear cylinder but I took of spark plug out put the spark plug wire back on the spark plug out of the head and fired it and it’s getting fire but for some reason the bike has no power at low RPMs and is lugging and I’m kind of stuck trying to figure out what else it could be

    Reply
    • Customer Service
      Customer Service

      Dear Perry

      Thank you for your patience. In regard to your question:

      If your FLHX is throttle by wire, it may be going into limp mode or limited performance mode.
      Try checking for any more possible codes that may lead you in the right direction. You might have a failing twist grip sensor.
      https://www.fixmyhog.com/post/shop-twist-grip-sensor-issues/

      We’d love to have you be a part of our community. We are convinced you will enjoy the benefits of becoming a member and having access to the best instructional how to videos and professional tips. We would like to offer you a special promotion for your first-year membership.

      https://go.fixmyhog.com/C12713

      If you have any other questions or concerns the membership, please contact Customer Service at 1-855-231-0653, or chat with us on our site and we would be happy to assist you.

      Sincerely,

      Mark
      Fix My Hog

      Reply
  75. Josh Plumlee
    Josh Plumlee

    NB 17080 Ticket I have a 99 xl1200c and mine runs fine until the temp reads 100 or so and then dies instantly. When it cools back down it will run fine again. I just got it back from the shop yesterday after 400 bucks charge and still doing the same thing. Any clue to what’s up?

    Reply
  76. mark albertus
    mark albertus

    Have a 1977 Super Glide with S&S carb. It has a miss at high speed. Can roll on the throttle, and will run good for a few seconds, then will start missing like crazy. Any ideas?

    Reply
  77. David Parton
    David Parton

    NB 17517 Ticket I have a 2003 Heritage Softail with a stock motor. I took the old stock pipes off and put on a set of shorties because I like the sound. The bike has been running strong for @ 3 wks. Now when I’m riding the bike for a few miles, I take off pretty fast. I hold my speed from 70-80. After holding this speed for a few miles, it starts sputtering like it has a bad spark plug or gas. I have ran at least 4 tanks of fuel through the bike and at a slow pace up and down the road, the bike is strong. It only does this at 70-80mph. It starts misfiring when I drop down to 55-60, It doesn’t do it as bad. I know something is breaking down. I was wondering if you have any thoughts as to what could be causing this. Also when the bike is idling, I can throttle it. It seems like nothing is wrong. There’s no smoke or anything.

    Reply
    • Customer Service
      Customer Service

      Dear David,

      Thank you for your patience. In regards to your question-

      Start by performing a full charging system test.
      https://www.fixmyhog.com/video/charging-system-diagnosis-002187/

      I hope this helps!

      Sincerely,

      Mark
      Fix My Hog Video Membership

      We’d love to have you be a part of our community. We are convinced you will enjoy the benefits of becoming a member and having access to the best instructional how to videos and professional tips. We would like to offer you a special promotion for your first-year membership.

      https://go.fixmyhog.com/C12933

      Reply
  78. raywkeeso
    raywkeeso

    17526 Ticket I’m having an issue with my 1993 Electra Glide FLHS. Stalled out three times (backfiring etc.) and wouldn’t restart for 20 minutes. It will restart and once I hit really wet roads/rain it does it again. The breather filter is dry so I suspect an electrical issue? Ideas where to start?

    Reply
  79. Purple
    Purple

    I just change the cam tensioners in my 2001 Road King took it out for a ride it starts spitting and sputtering under load in first second or third I changed the fuel lines fuel pressure regulator still same problem but needless to say it’s a magneti marelli EFI system

    Reply
  80. Kenneth Hatcher
    Kenneth Hatcher

    2001 Harley-Davidson Ultra Classic when I ride 12 to 14 miles engine dies if I try to start it back it just backfires and sputters if I wait 10 to 15 minutes fire up run just fine provide another 10 or 15 minutes

    Reply
  81. James Frescholtz
    James Frescholtz

    I have a 2001 Road King, fuel injection. Harley misses at idle, and loses power while riding at a even throttle. When I crack the throttle it accelerates quite well. When at idle and it is missing if I remove the rear plug wire no change, it does have a very good spark. Remove the front plug and bike dies. I have a stage one kit with gear drive. Any help out there? Thanks

    Reply
  82. Sagar Ds
    Sagar Ds

    is Vance&hines affect misfire in iron 883. As my dealer is telling to change to stock

    Reply
  83. Robert. Holmes
    Robert. Holmes

    NB Ticket 19833 Have s&s v96 bike was not ridden for awhile took it out last couple weeks backfiring when let off gas today i stopped for a bit bike didn’t want To start like it was flooded let it sit couple minutes then started it sounds like dogglng out changed fuel what do u think fuel filter I’m not much of mechanic up here in mountains none close by Wonlder if u could give me some tips appreciate it i will try To fix myself thanks

    Reply
    • Customer Service
      Customer Service

      Dear Robert,

      Thank you for your patience. In regards to your question-

      Backfiring can often be associated with a bad charging system.
      Start by performing a full charging system test.
      1st, need to determine if the issue is electrical or fuel related.
      https://www.fixmyhog.com/video/charging-system-diagnosis-002187/

      We’d love to have you be a part of our community. We are convinced you will enjoy the benefits of becoming a member and having access to the best instructional how to videos and professional tips. We would like to offer you a special promotion for your first-year membership.
      https://go.fixmyhog.com/C14040

      Sincerely,

      Mark
      Fix My Hog Video Membership

      Reply
  84. Kelly queen
    Kelly queen

    Front plug on 1200 sportster keeps fouling at about 35 miles has rebuilt carb s&s super e and drag pipes Should I go 1 point hotter bike runs good after I change front plug but eventually gets very black

    Reply
  85. jeff
    jeff

    NB Ticket 22534 ok 2006 softail springer never happens cold. after riding a bit when hot shut off eat lunch come out start bike runs like crap sputtering and back firing. only happens once in a while will happen then not again for a few months been going on for years. no codes replaced coil no change, had hole in fuel line in tank replaced lines, filter, and regulator no change. had codes for tps and iac motor at different times replaced parts took care of problem and code did not change other problem. any ideas? ecm?

    Reply
  86. michael Cheeseman
    michael Cheeseman

    NB Ticket 23385 I have a 2014 Sportster 1200 custom. wanted to know what operating temp should be. rode for about an hour ambient temp was around 75. engine oil temp got to 205 degrees

    Reply
  87. Joseph Kammer
    Joseph Kammer

    Will oiling the face of a k&n oil filter on a 2917-fxdb make it spit/miss

    Reply
  88. robert antonelli
    robert antonelli

    why does the timing cap and Ignition Sensor keep breaking in my 96 Electra glide classic harley davidson ive changed them twice in 1 year

    Reply
  89. lee
    lee

    1972 h-d flh , runs awesome until I turn on headlights, engine starts misfire, wher would be the first place tolook?? thanks in advance

    Reply
  90. Darrell
    Darrell

    I have a 96 softail, runs great, until it gets hot out, then acts like it’s running on one cylinder. I have an oil cooler. If I let it sit a few minutes it will run fine again for a while, not sure whats up.

    Reply
  91. bob
    bob

    Harley 04 fatboy misses when cold and choke on but smoothes out when warm with no choke on..why the miss when cold and choke on?

    Reply
  92. Aaron
    Aaron

    I don’t much about the newer bikes but my 76 sportster kind of did the same thing but had no spark on front jug adjusted the points and fired right up llike it was a new bike. But as like you I did everything else first before I checked the points. So now I always remember fuel spark compression

    Reply
  93. Charles Pothier
    Charles Pothier

    I just had that same problem with my flhtcu and it ended up being the fuel regulator right there by the fuel pump. The dealer replace this the fuel regulator and everything worked fine after that.

    Reply
  94. Derrick Hillier
    Derrick Hillier

    If You tried everything else & still have the same problem.Change the speed sensor on top of the transmission.No need to thank me if all is well after.

    Reply
  95. Craig
    Craig

    I have a 2012 Street Glide. Recently it started randomly loosing fuel to the front cylinder. I checked for the infamous fuel line issue in the tank, all good. The fuel pump housing was not clipped in and the sock was not attached, changed the fuel filter, checked spark and pulse to the injectors, swapped injectors, checked grounds, checked fuses and relays. I can start the bike and ride the hell out of it and it will run good. Let it sit for a little while, starts good then all of the sudden runs rough, no fuel to front cylinder. Codes P0118, PO131, PO151, PO152, PO261, PO1361 and PO1356. All the codes send me to a fueling problem. Anybody, HELP Please. I am doing this for my brotherinlaw who is broke and this is his only transportation, good thing we live in Daytona. Thanks

    Reply
    • Customer Service
      Customer Service

      Hey Craig!

      We’d love to help with your brother in law’s bike!

      The ‘Ask an Expert’ section is currently for members to our online community. We do have a promotional offer if you are interested. This would include access to expert advice (like this), plus discounts, hours of Premium videos, etc. Please feel free to take a look. You can message us right back with your question if you decide to become a member and you will have a response within 1-2 business days from our experts!

      Please follow the steps below to receive the annual membership at the introductory rate:

      1. Click on the email link: https://go.fixmyhog.com/c19696
      2. Click on the Premium Membership offer.
      3. The Checkout page will display your Premium Membership purchase.
      4. Fill in your Billing Details and create an account password.
      5. Fill in your debit/credit card information.
      6. Finish by clicking Complete Order.

      If you have any further questions, please contact Customer Service at 1-855-231-0653 at your earliest convenience, or chat with us on our site.

      We greatly appreciate your business!

      Sincerely,

      Jessica
      Fix My Hog Video Membership

      Reply
  96. Jerry
    Jerry

    If no spark hard start or no start it’s crank or can shaft sensor can check with strong light for pulse while cranking engine. I rather swap out one part then be riped off by these repair shops, $95. n hour. Two to three hours diagnosis. B’s, last give did my clutch, charged me for gaskets called up said I had leak he said he did job in end of August last year, yes but that was 6 months ago and 300 miles on bike since. I fix my own bike now . Buy crank sender about 120. If that don’t work then can not Hart to do and your still ahead of game, prevented maintenance. Sorry but I so jaded by rip off shops.

    Reply
  97. STEPHEN SUMMERLIN
    STEPHEN SUMMERLIN

    I HAVE A 1998 ROAD KING AND I HAD TO REPLACE ALL THE SEALS AND I PUT A LITTLE BIT BIGGER CAM IN IT. ALSO INSTALL NEW HEADERS. NOW ITS ALL BACK TOGETHER RIDE DOWN THE ROAD AND IT SPUTTERS AND POPS AT A FULL TROTTLE UNLESS YOUVE GOT THE RPMS REAL HIGH SOMETIMES. I PUT NEW PLUGS FIXED THE INTAKE LEAK BUT STILL HAVE THE ISSUE. FRESH GAS. WHAT COULD BE MY PROBLEM???? PLEASE HELP!!!!

    Reply
    • Customer Service
      Customer Service

      Hello Stephen!

      That’s a great question!

      The ‘Ask an Expert’ section is currently for members to our online community. We do have a promotional offer if you are interested. This would include access to expert advice (like this), plus discounts, hours of Premium videos, etc. Please feel free to take a look. You can message us right back with your question if you decide to become a member and you will have a response within 1-2 business days from our experts!

      Please follow the steps below to receive the annual membership at the introductory rate:

      1. Click on the email link: https://go.fixmyhog.com/C23059
      2. Click on the Premium Membership offer.
      3. The Checkout page will display your Premium Membership purchase.
      4. Fill in your Billing Details and create an account password.
      5. Fill in your debit/credit card information.
      6. Finish by clicking Complete Order.

      If you have any further questions, please contact Customer Service at 1-855-231-0653 at your earliest convenience, or chat with us on our site.

      We greatly appreciate your business!

      Sincerely,

      Jessica
      Fix My Hog Video Membership

      Reply