Turbo pressure noise under acceleration - help me tell dealer what to look for!
I've just received my 2002 S3 (225bhp) back from the body repair shop. It needed a new passenger side front wing and headling after a dustcart decided to scrape it down one side whilst it was parked...
Anyway - the car is now making a new noise. It can only be heard when accelerating and working the turbo, and initially sounds like a raspy noise coming from quite low down behind the passenger footwell or glovebox.
If you then release the accelerator, you get a whoosh / fizz noise, like the pressure is being dumped.
I had initially suspected the Diverter Valve problem as documented here:
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but having taken it to local mechanic and then Audi dealership, they don't reckon it is this, given where the noise seems to originate from (although I don't think they've done any proper diagnosis).
I'd appreciate any input you may have for me, so I can re-brief a mechanic for what to look for. So far I have:
- check for split pipes on/around intercooler
- check intercooler itself (I've heard of cases where seals can crack?)
- exhaust manifold/gasket from turbo
What else am I missing?
I'm obviously suspicious that something was damaged during the recent repair work, but until I find the cause it's difficult to prove. This post looked promising baring in mind I had the wing changed, but it would seem that this isn't something that could affect a standard un-modded car ?
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sorry for the essay! and thanks in advance