Sky InsuranceChris Nott
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  1. #1
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    Misfire when cold, when warm, misfire on WOT

    My 2001 S3 AMK has been giving me troubles over the last few months.

    Previously it was randomly misfiring, so on advice from the forum, I've checked for vac leaks and fixed the coil wiring.
    I've fixed a split pipe and replaced the thermostat, temp sender, and had a known working set of plugs/coils fitted.

    After all this my misfires only seem to happen now when the engine is at less than 90deg C temp or when @ 90 under WOT.

    I assume that I still have a VAC/Boost leak.

    What should I check? Also what blocks should I monitor in VCDS/VAG COM to aid in diagnosis.

    Any help is appreciated.

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  3. #2
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    Just an update, as soon as temp reaches 90degC(in VCDS) my misfire stops.

    So what VCDS blocks should I be checking?

  4. #3
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    OK, so i've checked block 032 and my fuel trims are -1.3 (short) and 0 (long).
    From my understanding of the sticky on checking for vac leaks these are acceptable.

    It does however suggest I am running rich on idle. What would cause this?

 

 

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