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Thread: uneven idle

  
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    vinny1416vastra's Avatar
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    uneven idle

    Can anyone help ive got 1999 1.4 16v and when i start it sometimes the idle speed is too high or it fluctuates,also i think at the same time the temp gauge is dead when this happens.sometimes i can start it and everything is ok .
    any help would be gratefull

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    Houstie's Avatar
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    i think sometimes vxl's just do this, i've had two astras and at some point they have both started and the revs have sat quite high.

    Mostly when its colder though.

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    A5TRA 59ORT's Avatar
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    high idle is done by the ECU to warm the engine up faster. if you leave it for 30-45seconds it will drop down to normal i.e 800-900 RPM.

    this is perfectly normal and nothing to worry about.

    as for fluctuating idle do you mean it drops really low and the car trys to stall and then jumps back up to around 1000RPM??

    if so your throttle body is probably dirty and could do with a clean.

    there is a how too somewhere but i got VX to do mine when they did the cambelt.
    they charged me £15 to clean the TB and reset the ECU. on top of the £220 for the cambelt change i weren't to bothered

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    that was a fairly reasonable price but yeah i thought i was pretty normal.

    Thanks for confirming that Astra

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    Could be a fault in the coolant temp sensor, although that should cause the coolant light to come one.

    If you hadn't mentioned the temp sensor I would point to 3 things to look at if you have rough/uneven idling.

    Clogged TB/Idle control valve
    Sticky throttle cable (obvious not for drive by wire cars)
    The dreaded AMM

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    uneven idle

    thanks everyone i will start by cleaning the idle control valve and plenum chamber with carb cleaner.

  7. #7
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    uneven idle

    I took the idle control motor out and it was gummed up with sludge cleaned out with carb cleaner and it has solved the idle problem.
    cheers all

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