Idle Drop

Question for Fix My Hog Premium member. 2007 Harley Davidson Ultra Classic. When I first start out on the bike, she will backfire when down shifting and cut off when coming to a stop with the idle dropping from 10,000 to 0. After riding for about 10 miles, this problem usually subsides and she idles fine around 10,000 rpms. Any suggestions?

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Fix My Hog Answers Back firing when down shifting is probably decel popping. This is caused by a lean condition. If you have a Power Commander or Vance & Hines FP3, you can add fuel @ 0% throttle. The FP3 also has an auto tune feature and another section designated to decel popping. As for the m/c stalling – Check for trouble codes and check for an intake leak.

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http://www.fixmyhog.com/video/custom-efi-mapping-installation-001395/
http://www.fixmyhog.com/video/vance-and-hines-product-review-007293/
http://www.fixmyhog.com/video/vance-and-hines-fuelpak-3-install-007295/
http://www.fixmyhog.com/video/troubleshoot-with-harley-error-codes-008010/
http://www.fixmyhog.com/video/twin-cam-harley-intake-seals-replacement-008713/

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Discussion
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9 Responses to “Idle Drop”
  1. Tyrone Sanchez
    Tyrone Sanchez

    My Dyna was backfiring yesterday, then I heard a loud pop and the oil dipstick popped out…what caused that to happen

    Reply
  2. jhre123
    jhre123

    Hmmm… 10,000 rpm idle huh? Well seems to me like you’re revving it a tad too high LOL….

    Reply
  3. Al Donaldson
    Al Donaldson

    There are other problems that may cause this and do not leave a trouble code! I have a 2007 softail custom that would stall when I stopped and sometimes the idle would move to 1400 – 2400 rpm’s. When I turned off the ignition then restarted, the problems cleared, no trouble codes. This has gone on since I owned the bike from new. No help from HD since they could not repeat the problems and no fault codes! Recently, I met a rider who had similar issues and asked if I had experienced them. He told me he found out HD had a bad batch of TPS modules, (Throttle Position Sensor), and had his replaced and has replaced and the problem has never returned. I had mine replaced and also replaced the cylinder head temperature sensor and the issue has not returned.

    Reply