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    VW Passat 2000 1.8 nonturbo APT Archived Message

    Posted by peter doughty on May 25, 2008, 3:53 pm

    This vehicle is running rich, starts and runs ok until it reaches 80c and then it will not idle and is difficult to drive.
    There are not any codes stored.
    O2 reads 0.84 constantly but does change if given air leak, plugs are black with soot. A new mass air (non gen) has been fitted with no change.
    The problems seem to have started with light body work and paint job (not oven)
    The vacuum reads a steady20in/hg on idle until the engine starts to hunt.
    Disconnect mass air and the vehicle runs better but O2 readings do show a leaner mixture, fuel trim shows the ecu trying to lean off the mixture.

    I can’t see anything that is causing the fault.

    Your thoughts would be appreciated.

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