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Misfire

This is a discussion on Misfire within the General Help forums, part of the LSx Technical Help Section category; What is the likely hood of piston/valve damage from a misfire?...

  1. #1
    Senior Member TransAm11973's Avatar
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    Misfire

    What is the likely hood of piston/valve damage from a misfire?

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    From that description I would say unlikely.

    Exactly what happened?


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    Senior Member TransAm11973's Avatar
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    well first off its my wifes car not mine ( a VW). And its under a aftermarket warranty. So I cant get my paws on it too much, Well I will be pulling the plug/wires etc. I am getting P0304 so its cylinder 4 misfire. The freeze data shows that at the time of misfire the fuel trim was at -100.4 which is a lot. But I am not getting any fuel system codes at all. So I am leaning towards the plug or wires, hopefully not a gasket. Anyway I havent dealt with many misfires in my time, just never had them. But when the car runs its jerky, which is about right a #4 being out, but there is a distinct tap/click noise which makes me wonder if there is valve or lifter damage.

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    LSwut tep98ws6's Avatar
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    What kind of car? Don't rule out injectors or even throttle position sensor (losing signal causing a misfire sensation)

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    Royal pain in the.... Phantom2kz's Avatar
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    po304 i would check the connections to the fuel injector and swap the spark plug,wire and coil with #6 and see what happens,
    is this a 6 speed car, i have seen some bent/broken pushrods from overrev, usually mis-shift.

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    Senior Member TransAm11973's Avatar
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    wasnt over rev was at 2100rpm's its a 4cycinder turbo

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    Quote Originally Posted by TransAm11973 View Post
    What is the likely hood of piston/valve damage from a misfire?
    None.
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    LSwut tep98ws6's Avatar
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    4 cylind turbo? Audi or VW? Ignition coil recall. Check it out.

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    Senior Member TransAm11973's Avatar
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    Quote Originally Posted by tep98ws6 View Post
    4 cylind turbo? Audi or VW? Ignition coil recall. Check it out.
    yeah its a 2000 VW Passat .....hmm thanks for the info, I will have to check that out

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