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b0nd007

Audi s3 2008 - Rev keep going up and down when idle

Hi
Wondering if a can get any advice with a problem that just occured yesterday

I have a 2008 S3 (29k mile) - when driving the car no issue. However when the car is idle the Revs go up and down.  Revs go roughly between 0.7 - 1.8.

No lights on Dashboard to indicate any fault.

I have tried red lining to see if turbo fully working but still has same issue.

Any suggestions as to what the problem could be

Will a VAG/Bosche Diagnostics reader indicate a fault code?

Thanks
AudiiduA

Get it plugged into a proper vagcom
sounds like idle control valve, but not 100% sure it has one fitted?
if not then maybe sucking in air through split pipe or gasket??
only guessing get it on vagcom.
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