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What is making this happen??

This is a discussion on What is making this happen?? within the Computer & Tuning forums, part of the LSx Technical Help Section category; ok..i've got a misfire on my 8th cylinder...on when at an idle..but i get a serious backfire sometimes at a ...

  1. #1
    Sleeper Brad(WS/Z0.6)'s Avatar
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    What is making this happen??

    ok..i've got a misfire on my 8th cylinder...on when at an idle..but i get a serious backfire sometimes at a stoplight or sitting still...sounds like shooting the exhaust pipe with a bb gun..LOUD!!! good plugs..no loose wires, no leaks of any kind..nothing!! What do i do?!?!

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    cutting and welding mark21742's Avatar
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    hugger orange
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    I'm just guessing here.
    maybe a sticking injector or a valve not seating good (maybe slightly bent valve).
    if you can, swap your number 8 injector with another cylinder and see if your miss fire moves to the new cylinder

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    Sleeper Brad(WS/Z0.6)'s Avatar
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    will do...hope thats the problem

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    cutting and welding mark21742's Avatar
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    hugger orange
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    Quote Originally Posted by Brad(WS/Z0.6) View Post
    will do...hope thats the problem
    like i said man, im just throwing out a guess. good luck man!

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    Member Red99TA's Avatar
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    I'd almost suggest swapping the coil too just to be sure, you never know

  6. #6
    grand poobha james schofield's Avatar
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    do you have leak down tester? that would tell you if you have any valve problems. probaly a bent exhaust valve, it doesn't take much to bend it enough to misfire.

  7. #7
    Sleeper Brad(WS/Z0.6)'s Avatar
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    unfortunately, my buddy that has all the cool gadgets to test for leaks and other problems just moved to tennessee a few months ago...so i dont have anyway to access those things....but i do plan on gettin in a shop that has one soon...

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