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Thread: Backfire At Idle

  1. #1

    Default Backfire At Idle

    Having issues with a small backfire from the exhaust while at idle. Timing is good. Set at 10°, HP @ 10°. Thought it would start to clear up while in Learn mode and no. Car has not been driven yet or at WOT, just because of the small exhaust backfire. Has anyone else had this issue?

  2. #2
    Join Date
    Nov 2013
    Chicago IL


    Many things can cause a backfire.
    It could be as simple as a fouled out plug (or a cracked/broken spark plug).
    Or it could be something bigger like an intake leak causing a very lean condition on one cylinder.
    You will have to do some investigating to figure out what is causing it.
    Also, make sure your programmed firing order is correct, and put a fresh set of plugs in it.
    Don't forget to check out progress on my Race Car:
    Project Blasphemy - 8.07 @ 171
    Low 8 Second Street Car

  3. #3


    Firing Order is correct on the car & HP. New wires & new plugs. Didn't have the issue till we went with the HP.

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