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Rev/Idle hunting, boost fluctuation on WOT inc fix

Discussion in 'Audi S4/A4/A4 Cab (B7 Chassis)' started by solaris, Mar 5, 2012.

  1. solaris
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    solaris Member

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    [Mar 5, 2012]
    So recently my car has suffered the following symptoms:-
    Idle
    Generally rather rough, erratic and a lot higher than normal (1100rpm) when the car is at operating temperature. On occasion the idle will start hunting until it reaches 1000rpm-1100pm
    Boost
    I've noticed the boost pulses on wide open throttle (WOT) but this was happening prior to the revs being unstable so maybe it's an initial sign
    Economy
    Reduced MPG

    This went on for 3 days before lighting up the MIL light, quick scan with VAG-COM showed the fault codes:-
    001287 - Idle Control System RPM
    P0507 - 001 - Higher than Expected. - Intermittent
    Freeze Frame:
    Fault Status: 00100001
    Fault Priority: 0
    Fault Frequency: 9
    Mileage: 90458 km
    Time Indication: 0

    Freeze Frame:
    RPM: 899 /min
    Load: 14.9 %
    Speed: 0.0 km/h
    Temperature: 83.0°C
    Temperature: 35.0°C
    Absolute Pres.: 1020.0 mbar
    Voltage: 13.970 V

    008583 - Bank 1; System too Lean at Idle
    P2187 - 004 - - Intermittent - MIL ON
    Freeze Frame:
    Fault Status: 10100100
    Fault Priority: 0
    Fault Frequency: 7
    Mileage: 90466 km
    Time Indication: 0

    Freeze Frame:
    RPM: 788 /min
    Load: 14.1 %
    Speed: 0.0 km/h
    Temperature: 87.0°C
    Temperature: 61.0°C
    Absolute Pres.: 1020.0 mbar

    Voltage: 13.462 V


    All the symptoms and fault codes pointed towards the PCV valve, so I ordered the PCV (part number 06F129101N) and a new gasket.

    This is the part in the engine bay
    [​IMG]

    Old and new part side by side
    [​IMG]

    It was a case of removing the 2 hoses unscrewing 4 screws (T25 torx) swap out the old gasket cleaning any oil residue/deposits and fit the new PCV. It took me around 10-12mins to fit the part.
    [​IMG]

    Idle is now sorted and very stable, MPG looking great again, boost is holding and hitting the correct PSI. In my opinion if your car has over 50k miles i'd advise to swap this part out as a pre-emptive measure. Hope this has been informative :)
    #1
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  3. Stringster
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    Stringster Missed gear

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    [Mar 6, 2012]
    Very useful post - thanks. Will be looking at changing this part soon. Is it from the dealer and how much?

    I remember on the 1.8T I used to clean the PCV out - is this not an option on the 2T?
    #2
  4. Khanage
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    Khanage Member

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    [Mar 6, 2012]
    What engines is this suitable for?
    #3
  5. solaris
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    solaris Member

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    [Mar 6, 2012]
    2.0 TFSi
    #4
  6. mancdan
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    mancdan Member

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    [Oct 18, 2012]
    Thanks Solaris, have ordered the PCV £37 and Gasket £18.40 from Audi and pick thm up tomorrow.
    #5
  7. murran
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    murran Active Member

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    [Oct 18, 2012]
    same as the threads in the a3 section. common problem.
    #6
  8. mancdan
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    mancdan Member

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    [Oct 19, 2012]
    OK, PCV and gasket successfully changed. Took me about 15 mins once I got the correct tools!
    Part Numbers & prices were as follows: PCV at £37 = 06F 129 101N and Gasket at £18.40 = 06F 103 483E

    Fingers crossed it improves my erratic idle speed and hunting as described above.
    #7
  9. mancdan
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    mancdan Member

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    [Oct 22, 2012]
    Nope, hasn't really fixed the issue as I am still getting erratic idle. I is different on every journey I make!
    To make it worse the Emission Control Warning light has come on again, ffs these Audis........
    #8
  10. steviekill
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    steviekill New Member

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    [Jan 20, 2013]
    Mancdan, I have almost exactly the same problem, changed the PCV and gasket but still the Emission Control Warning light comes back and stays on after clearing the codes..

    Have you had any success since this posting in October last year and if so what was the correct diagnoses and repair please because I would love to know (it's frustrating to say the least!).

    The codes that the VAG-COM displayed are shown below:

    1/3 ID:2187 -01
    08583
    System too rich off idle, Bank 1
    System too lean at idle speed

    2/3 ID:2261 - 01
    Recirculating valve for turbocharger -
    N249 mechanical malfunction
    short circuit to another valve

    3/3 I: 0507 - 01
    01287
    Idling speed regulation RPM above specified value
    value of resistance too small

    I am completely lost now and close to pulling out all my hair so hopefully you can help
    #9
  11. mancdan
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    mancdan Member

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    [Jan 21, 2013]
    Steviekill - I have now had this issue diagnosed & fixed. Turns out it was the N80 valve which I think connects to one of the pipes going into the PCV Valve. They are approx £25 from Audi and takes approx 45-60 mins to fix. (Although I had a mechanic fix mine)

    The erratic idle has completely disappeared and Emission Control Warning has not come back on at all. Its ike having a new car again!
    #10
  12. steviekill
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    steviekill New Member

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    [Jan 21, 2013]
    Good to hear you managed to diagnose the problem and get it fixed for a relatively low price!

    Right I will pursue that line of enquiry but I must say that I haven't really noticed the following symptoms you mentioned at the top of this thread..?

    "Generally rather rough, erratic and a lot higher than normal (1100rpm) when the car is at operating temperature. On occasion the idle will start hunting until it reaches 1000rpm-1100pm"
    #11

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