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AUDI A3 idle problem 1.6 please help

Discussion in 'A3/S3 Forum (8L Chassis)' started by m3will, Jun 30, 2008.

  1. m3will
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    m3will New Member

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    [Jun 30, 2008]
    Hi I have a 1999 t plate a3 1.6 sport. It has an idling problem in that it the revs are hunting up and down when you are standing still. my local garage put it on the diagnostics and say it is the idle control motor which is £242????????????????? Is this right, I have checked for airleaks and the manifold flaps so is there any thing else to check before I shell out ??

    thanks
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  2. Clach
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    Clach A3 - 1.8Ts

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    [Jun 30, 2008]
    throttle body clean....?
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  3. Shy19s
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    Shy19s Oil running through my veins.

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    [Jun 30, 2008]
    Check the pipes around the intake leading from the rocker cover to the intake. Also clean our your throttle body and manifold, run some injector cleaner.. clean the MAF too.
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  4. m3will
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    m3will New Member

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    [Jun 30, 2008]
    just ordered a new throttle body off ebay as it contains the idle control motor, will let yo uknow if it sorts it
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  5. FactionOne
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    FactionOne Administrator Staff Member Administrator

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    [Jul 1, 2008]
    That's a good chance...

    I've fiddled about with a few 1.6 A3s with similar problems (as a rule I think it's fair to say that 90% of them will exhibit this problem sooner or later). Throttle Body tends to be the fix in my experiene (as you say, the ISV (Idle Stabilisation Valve) is integral to it), but as is noted above, a dirty (/sticking) throttle body can be the cause too, so it's always worth a go at cleaning it. Also the advice about the MAF is good too, but often you'll see weird behaviour 'out-of-idle' too if that's the cause. Coolant Temperature Sender faulty/leaking can also ruin your idle too...

    Regards,

    Rob.
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  6. FactionOne
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    FactionOne Administrator Staff Member Administrator

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    [Jul 1, 2008]
    Oh yeah... And the Camshaft Position Sender (Hall Sender) can also make it run a bit roughly too...

    Regards,

    Rob.
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  7. NHN
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    NHN Retrofitter - Audi - VW - Skoda - Seat Site Sponsor VCDS Map User

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    [Jul 1, 2008]
    Why didnt you follow the advice of a TB clean fella as this is a well known as something to be done now & then, this might have saved you the cost & time to fit it, it takes about 30mins to 1 hour & then you need to do a TB alignment with vagcom.
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  8. m3will
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    m3will New Member

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    [Jul 2, 2008]
    I cleaned the TB first before putting up the post. New should be here today so ill report back thanks for all the advice
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  9. NHN
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    NHN Retrofitter - Audi - VW - Skoda - Seat Site Sponsor VCDS Map User

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    [Jul 2, 2008]
    Fair play fella, just thought I'd ask as didnt say you had done already, well let us know what you find is issue.

    One other thing I know of is a sensor/sender for idling causes this problem as I think Faction also mentioned, seems common aswell but not sure where it is.
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  10. jbw
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    jbw Member

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    [Jul 2, 2008]
    I had this with my T reg 1.6 a3. Not trottle body, nor sensors nor the idle control motor it was simply an airleak post fuel mix. The specialist in evesham had the car all day, taped up a pipe, reset the ecu and job done. £50 and I had a completely different car.

    This compared to audi who replaced a whole load of things over 2 years and never managed to fix it.
    If you're anywhere near Evesham I'd seriously recommend giving the motorvation specialist a call.

    ta,
    jbw
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  11. NHN
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    NHN Retrofitter - Audi - VW - Skoda - Seat Site Sponsor VCDS Map User

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    [Jul 2, 2008]
    Actually thats also a possibility, given the age of car its more than a possibility as pipes do harden & split over time huh, worth a try
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