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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

    abdus Top Gear
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    .......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
     
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  3. Caesium

    Caesium My BM is fixed!
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    There is an idle speed compensator for the load placed by the AC compressor. Its clearly not working.
     
  4. abdus

    abdus Top Gear
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    where is that exactly?
     
  5. rickparmar

    rickparmar va va voom

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    in the car:lmfao:

    sorry i have no idea
     
  6. abdus

    abdus Top Gear
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    FAIL....

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

    HTC Active Member

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    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.
     
  8. jojo

    jojo Looking for Boost!
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    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.
     
  9. abdus

    abdus Top Gear
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    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...
     
  10. Caesium

    Caesium My BM is fixed!
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    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?
     
  11. abdus

    abdus Top Gear
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    all sorted...

    throttle body needed a clean :)
     
  12. Caesium

    Caesium My BM is fixed!
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    oven cleaner is the best stuff to clean them with...
     

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