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Thread: Engine misfiring when aircon is on

  1. #1
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    Vehicle : Signum

    Trim : Elegance

    Engine : 2.2 Direct

    Year : 2003

    Default Engine misfiring when aircon is on

    What with this sudden "summer", it's been the first time i've had the aircon on in the car since i bought it late last year.

    Trouble is that when i have the aircon on, the car seems woefully slugish but more worryingly it seems to misfire and hesitate. Doesn't matter if i'm accelerating or have my foot off the pedal as i coast and slow down.

    I know the power steering and aircon are al powered electrically (or are they? Is the aircon belt powered?)but surely even with the aircon on, there should still be enough power left to power a spark plug??????

    As soon as the aircon is turned off, the car runs smooth again.

    Any Ideas? Car is a 1.8 Club manual

  2. #2
    South Wales Assistant Regional Organiser davidjameswest's Avatar
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    i had a similar problem on my mondeo st24 and never got to the bottom of the problem mate

  3. #3
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    Vehicle : Signum

    Trim : Elegance

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    Year : 2003

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    Quote Originally Posted by davidjameswest View Post
    i had a similar problem on my mondeo st24 and never got to the bottom of the problem mate
    Damn, and i was hoping for a "A sensor connection has come off. Just plug it back in"

  4. #4
    Ex Vec-C Admin Deztroyer's Avatar
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    is anything else electrical on ??

    had similar issues on a ford focus 1.6
    if heated screen and fans and headlights were on i couldnt open the drivers window
    turn off the fans or heated screen and windows worked
    underpowered alternator was the cause

    0-Large smile ......every time it's driven

  5. #5
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    does the engine respond to the AC being switched on? it should pick up a little to compensate for the extra load at idle. Perhaps the ecu is not getting the input to do this.

  6. #6
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    Vehicle : Signum

    Trim : Elegance

    Engine : 2.2 Direct

    Year : 2003

    Default

    Yep, engine picks up when aircon is on.

    Can't see any leaks, aircon is cold. No other electrical items on, not even the radio.

    Aircon does squeel sometimes though. Was wondering if the belt driven motor was siezing or something so was causing the engine to go slightly out of sink as it may struggle to turn it.

    Does that make any sense at all?

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