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2.0T running a little sluggish and intermittent miss at idle

Discussion in 'Audi S4/A4/A4 Cab (B7 Chassis)' started by prel2000, May 31, 2012.

  1. prel2000
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    prel2000 Member

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    My 2.0T Quattro (manual) is running a little sluggish and suffers an intermittent miss at idle.

    Diverter valve has already been swapped out for latest D version. Have also changed the clutch switch which made a slight difference, however there is still a miss when the car sits at idle.

    The performance is also lacking compared to what it used to be. However, intermittently there is something that triggers in the car or a module that kicks back into life and transforms the drivability. This generally occurs when the car is sitting idle for a bit (in traffic or at lights) or switching engine off and on after its been driven for a bit. (This is what makes me think its a module that kicks back into life).

    It appears to be a airflow problem of some sort but we just cannot pin point it.

    The car has recently had a service during which the air filter was also replaced (clutch switch changed at same time).

    Any recommendations on where to go next will be much appreciated. Or a recommendation to decent specialist in east London will be good.

    Thanks in advance.
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  2. bez101
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    bez101 Yorkshire & Humber Rep. Regional Rep

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    1st off i would get it scanned for fault codes
    then take it from there
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  3. weekenny
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    weekenny Member

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    Have you had the coil pack recall done?
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  4. murran
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    murran Active Member

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  5. prel2000
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    prel2000 Member

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    Firstly, thank you for all for the replies so far...been busy reading about all that's been suggested so far and now I am thinking it could be many things....please nooooo..! I absolutely love the car (the most fun of all that I have owned) but dont want to start spending silly money putting it right!

    The coil pack recall was carried out May 2011.

    I have had the fault codes read and the car has 1 logged;

    01602 - Electric drive motor (V141) sporadic 002 - lower limit exceeded.

    Have googled this and I cannot find a definitive resolution for those (there are a few) that have experienced this. Found something on the GTI forum pointing towards intake manifold tumble flap.

    Any other suggestions on where I can go next with regards to the above or is it a code thats as a result of something else that maybe wrong.

    Ive also read that VW/Audi US have a recall on the Intake flap module and PCV for all TFSI engines. Has anyone heard of this here in the UK?

    Thanks in advance again.
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  6. prel2000
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    prel2000 Member

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    Murran - I did attempt to take the oil cap off when engine was running and yes its was a bit of a struggle to remove it.

    Also the revs were very unsettled once I did manage to get it off.

    Does this indicate an issue with PCV?

    Thanks
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  7. murran
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    murran Active Member

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    yes, yes it does. it should be no more difficult to remove the cap whether its ticking over or when the engine is off.
    what causes the difficulty in removing the cap is the vacuum created in the inlet manifold being transfered to the crankcase via the faulty pcv valve. this vacuum holds the cap down.

    if you manage to remove the cap on one thats faulty the engine will struggle to tick over at all.
    but on one thats fine, it just upsets the idle slightly.
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  8. viceroy
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    viceroy Member

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    Do you know if the PCV from an A3 2.0T BWA is interchangeble with one from an A4 2.0T BWE?

    Reason I'm asking is audi have told me there is no problem with my PCV valve (which they supposedly changed 2 weeks ago) and I want to prove them wrong by putting my A3's valve onto my A4 to see if it sorts the issue.
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  9. prel2000
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    prel2000 Member

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    Has anyone had this or recognise this code and know where to go with it?

    01602 - Electric drive motor (V141) sporadic 002 - lower limit exceeded.

    The intermittent miss on the car can also be replicated when using the electrics i.e. when toggling window switch, cental locking and power steering, so I am wondering if I have a electrical problem?
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  10. prel2000
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    prel2000 Member

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    Just to provide an update on this problem for those looking for a solution...as my problem is RESOLVED..!! wohoooo..!

    Basically changed the Crankcase breather valve (AKA - PCV).

    No more miss and the performance is back...all the 249 Brake Horse (after AMD remap) are now back in full flow...boy did I enjoy the commute today!

    I dont have the part number to hand but will list that here to make life easier for those wanting to order one. Its the same part for most of the engine numbers.

    Special thanks to Murran for pointing me in the right direction..TOP MAN..!
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  11. murran
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    murran Active Member

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    as a comparison did you try the "removing the oil cap while ticking over test" again once youve changed the valve?
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  12. pburv
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    pburv Member

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    Hi all.. I too have had the same probs with the pcv. I ordered the part from my local Audi dealer. It cost me 36 pounds all in, this did not include the seals.. anyway the part number is 06F129101N.. I was told this is the most upto date version there is. This is for a BUL designated petrol 2.0 ltr turbo quattro engine . Not sure if it fits other types of engine? Hope this helps anyone..
    #12

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