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Thread: Dodgy idle

  1. #1
    andyherd's Avatar
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    Dodgy idle

    Hi folks,

    Whenever the revs drop to an idle, either from start up or stopping whilst driving, my car hunts from 400 to 800 rpm for about 10-15 seconds before leveling out at the normal 850. It seems almost as if its about to cut out some times, with the engine up to temperature the problem still remains.

    I thought it may be caused by the idle stabilisation valve being clogged up and needing a clean but being a 20vT virgin I don't know where it is under the bonnet. Can anyone help or give me another possible cause?

    Cheers

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  3. #2
    finesse's Avatar
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    Rough Running At Idle - MAF, Ignition Coil, Spark Plug, VAC Leak, O2 Sensor, TB, CTS
    Last edited by finesse; 29th October 2010 at 13:22.

  4. #3
    bengal's Avatar
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    I had this and it was the maf sensor i changed it to a genuine bosch unit and all was well. your best getting it on vagcom to see if theres any fault codes and you could try running it with the maf unplugged to see if it goes away if it does its the maf. I dont think theres an isv on these there isnt on mine but might depend on engine code.

  5. #4
    Welly's Avatar
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    Yep, unplug the MAF and see what happens.

    If it's still doing it, start hunting for vac leaks.

    Failing that, Coolant Temp Sensor is the next stop.

    They are the three most common causes.

    Adding to this - the 1.8T doesn't have an idle control valve.
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  6. #5
    andyherd's Avatar
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    Thanks for the advice chaps, gonna try the MAF first and will update
    '06 Akoya Silver A3 TDI Sportback

 

 

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