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Thread: does my car have a problem....?

  1. #1
    Regular Member david.aka.judas's Avatar
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    Default does my car have a problem....?

    finished work today, got in the car and it was reading 31 deg C.

    straight after starting the car I turned the air con on and it caused the car to run really lumpy.

    turn the air con off, back to normal, back on lumpy.....??

    it only felt lumpy on idle.

    after the trip, i sat on the drive and it wasn't doing it anymore....

    is it:

    1. a problem
    2. going to be a problem
    3. you have a vectra get used to it...........

  2. #2
    Regular Member mat osborn's Avatar
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    mine does the same when ac compressor kicks it causes revs to drop slightly

  3. #3
    Regular Member ghostrider's Avatar
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    Vehicle : 2.0l CDTi Bi-Turbo Insginia Sports Tourer

    Trim : Vx Line Nav Sri

    Engine : 2.0

    Year : 2014

    Default

    As above. Mine runs noticably less smoother with the AC on (as did the other 2)

    I'll go for no. 3 - seems to be the norm i'm afraid.

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    yes mine to although it need a re-gas so not using it at the moment

  5. #5
    Regular Member Vauxhall Thru & Thru's Avatar
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    I think it's probably normal. The AC is an additional power off-take from the engine; the ECU probably invokes a different fuel schedule when AC is on to take account of the extra load. Hence the revs blip, and the lumpiness. Just my thoughts, may be completely wrong!

  6. #6
    Regular Member david.aka.judas's Avatar
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    i know it runs lumper (is that a word lol) but this was more than usual.

  7. #7
    Administrator plasma's Avatar
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    Vehicle : Vectra

    Trim : SRi

    Engine : 150

    Year : 05

    Mileage : 74000

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    mine feels like it wants to almost stall with the aircon on at idle! but is normal

  8. #8
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    I've found consistently over 2 years, that my 3.0 CDTI's electronics raise the engine idle speed a bit at exactly 25 degrees and above, with the A/C on. As soon as the outside temp drops below 25, things return to normal. Also (of course) the idle fuel consumption goes up from 0,3 g/hr to 0.4 g/hr.

  9. #9
    Regular Member m8internet's Avatar
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    I have the air conditioning on at all times
    There is no difference in revs, whether the engine is cold or warm
    Presumably the 3.0 V6 CDTI ECU recognises that the air conditioning is on so maintains the same idle revs

    In previous cars with air conditioning the revs normally increase slightly when the engine is cold

  10. #10
    Regular Member bigcarman79's Avatar
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    The ECU should compensate for the air con being ON, revs should be very slightly higher than normal when cold.

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