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View Full Version : Where is my boost going?



audiyoudo
19-05-2008, 07:57 PM
Hi
Having some boost issues with my 2002 S3. The turbo starts to boost until about 4000rpm, then it just hisses and loses power then boosts then hisses etc etc. It will rev, but doesn't pull smoothly like it should.
Have just replaced MAF, which cured a 3000rpm hesitation.
Any ideas?
Thanks
Andy

kenney
19-05-2008, 08:33 PM
Hi Have you checked the hoses sounds like there is a split in one of them

mluton
19-05-2008, 08:40 PM
As above, 1st point of call, Then a Fault scan

Niklock
23-05-2008, 06:37 PM
I would check the recirc valve too

audiyoudo
23-05-2008, 06:51 PM
Is the recirc valve the black plactic bit with 2 large and one small pipe or is it the black solenoid valve with a couple of wires coming out of it.? Both towards the back right of the engine.
Thanks
Andy

Niklock
23-05-2008, 09:46 PM
Its the two largeish pipe thing you were on about, the factory ones are rubbish your better off going for a forge one especially if your tuning, make sure you get a recirculating one though.

audiyoudo
19-06-2008, 09:13 PM
Valve has been replaced, but it is still not right. When the weather is cold and damp it goes like hell, but when the air temp is higher it feels lethargic. but that may be a coincidence. has anyone had problems with fuel starvation?