Thread: Random multiple misfires issues

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  1. #1 Random multiple misfires issues 
    GTP Level Member Austins01GP's Avatar
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    This issue started a while back and can be viewed here

    http://www.grandprixforums.net/threa...down-sometimes

    Today no matter how many times shut off my car (2005 comp g) it will not run normal. The car wants to bog down and is jerky while accelerating. There are no codes showing on my scan gauge. currently but last week it through p0300 random multiple misfires. Watching the misfires today it was showing cyl. 2,4,6 were randomly missing. I replaced the ICM to no avail.

    Any ideas whats broken?
    // 1992 Nissan 300zx Twin Turbo (More RWHP than the Comp G)
    // 2005 Comp G
    CLICK ME!! for my Z Build and Comp G

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  2. #2 Re: Random multiple misfires issues 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Time to maybe rip apart the wire harness and see if any damage can be seen.

    SMGPFC Member #1
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  3. #3 Re: Random multiple misfires issues 
    GTP Level Member Austins01GP's Avatar
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    Well that doesn't sound fun... lol
    Might be possible tho, it was raining today, possible wire issue
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  4. #4 Re: Random multiple misfires issues 
    Killa Bee Scottydoggs's Avatar
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    im thinking clogged cat, that would make it bog, or kinda sound like a vaccum with a full bag, or your hand blocking the suck tube off.

    bad cat also causes random misfires.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  5. #5 Re: Random multiple misfires issues 
    GTP Level Member Austins01GP's Avatar
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    Car sounds normal from what I can tell. The cat was replaced with in the last couple years no strange smell either (not that that method is fool proof lol)
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