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Erratic Idle

Discussion in 'Audi S4/A4/A4 Cab (B7 Chassis)' started by Olly P, Mar 27, 2013.

  1. Olly P
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    Olly P My other cars a mk2 Golf GTi

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    So, i've got an erratic idle on my 2005 A4 DTM. Fairly regularly, when I come to a stop the revs rise to around 1200 then lowly falls back to 800 ish.

    I've taken the car to a garage to fit coilovers recently and asked them to look at the problem They fixed a small boost leek and this cleared the engine management light.... after a day its now retuned.

    Is there anything I should check before taking it back? I don't have a copy of vag-com so can't scan for the code, i'm just wondering if any ones had similar problems? I've seen a few threads suggesting that it could be a faulty PCV valve?

    Any help much appreciated
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  2. B5NUT
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    B5NUT Well-Known Member

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    I would look at the MAF, you could unplug it and see if the fault still occurs. Had this on a couple of my A4's and and it was the MAF. First one I was able to clean the other had to be replaced.
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  3. Olly P
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    Olly P My other cars a mk2 Golf GTi

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    Brilliant, thanks for the info :icon_thumright:
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  4. claudefrog
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    claudefrog Member

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    I heard the coolant temp sensor can also cause this issue, if you scan the car with vag-com or even a generic OBD reader it will help point you in the right direction.
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  5. mancdan
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    mancdan Member

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