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Why does the car turns off when...

Discussion in 'A3/S3 Forum (8L Chassis)' started by abdus, Aug 7, 2008.

  1. abdus
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    abdus Top Gear VCDS Map User

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    [Aug 7, 2008]
    .......aircon is switched on on idle.

    The revs start to drop and then car turns off.

    I have run vagcom and there is no fault codes.

    Any help please.

    Thanks
    #1
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  3. Caesium
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    Caesium My BM is fixed!

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    [Aug 7, 2008]
    There is an idle speed compensator for the load placed by the AC compressor. Its clearly not working.
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  4. abdus
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    abdus Top Gear VCDS Map User

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    [Aug 7, 2008]
    where is that exactly?
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  5. rickparmar
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    rickparmar va va voom

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    [Aug 7, 2008]

    in the car:lmfao:

    sorry i have no idea
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  6. abdus
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    abdus Top Gear VCDS Map User

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    [Aug 7, 2008]
    FAIL....

    should be in the engine compartment[​IMG]
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  7. HTC
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    HTC Active Member

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    [Aug 7, 2008]
    When the aircon is switched on the ECU logs the change. Idle should be increased via the throttle body. If that isn't occuring, either the throttle body requires cleaning an re-aligning or you have a vacuum leak.

    Is your idle at all lumpy when the AC is off? Idle can be adjusted to raise it a little. Not sure if there is a separate idle setting for when AC is on, probably not.
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  8. jojo
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    jojo S3 Drift King! Staff Member Moderator

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    [Aug 7, 2008]
    Whilst on this subject, don't suppose you know if a 1.9 PD diesel motor has the same sort of thing? I'm having issues similar with my Passat.

    Thanks.
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  9. abdus
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    abdus Top Gear VCDS Map User

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    [Aug 8, 2008]
    idle is perfect when aircon is off.

    it only happens when aircon is on and some random times, it doesn't do it at all.

    I followed steps regarding throttle body re-alignment on vag-com, it said all was fine ADP OK etc...
    #8
  10. Caesium
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    Caesium My BM is fixed!

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    [Aug 8, 2008]
    Yes, if i remember correctly, there is a throttle bypass valve which opens and controls the idle speed, it get shitted up and needs cleaning out.
    I may be thinking of another engine, maybe someone with EKTA installed can look at the intake diagram and confirm?
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  11. abdus
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    abdus Top Gear VCDS Map User

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    [Aug 8, 2008]
    all sorted...

    throttle body needed a clean :)
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  12. Caesium
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    Caesium My BM is fixed!

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    [Aug 8, 2008]
    oven cleaner is the best stuff to clean them with...
    #11

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