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Requested MAF and Actual MAF values

Discussion in 'Diesel forum' started by Illusion-Paul, Jul 2, 2012.

  1. Illusion-Paul
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    Illusion-Paul Member

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    [Jul 2, 2012]
    I have an issue with my car - A4 3.0TDI

    It all started when i didn't think i was getting good enough fuel economy

    I have replaced the airfilter to a K&N
    I have cleaned the EGR, and actually disconnected the pipe so it remains closed now.
    Cleaned the first plastic inlet manifold

    I have done a few VAG logs and the issue is this:
    Requested Boost and Actual Boost are about the same

    The MAF requested takes a step change when foot is fully depressed on the throttle,

    However the Actual MAF values take a very long time to get there, but never reach the requested value
    At 3000 rpm, it is almost at the requested, however then it levels off below the requested value.

    Can someone give me any idea what could be wrong?
    Will post the graph up tomorrow

    Thanks
    #1
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  3. Illusion-Paul
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    Illusion-Paul Member

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    [Jul 3, 2012]
    [​IMG].
    Last edited: Jul 3, 2012
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