hey guys,
i just hav a quick problem. i own an a3 1.8T andlately ive started to notice that the engine bay is starting to make a blow off valve noise when pressure on the accelerater is released. problem being i dont hav a blow off valve. makes the car sound almost sick.

wht could be the problem and how might i fix it.

cheers,

 

Sounds like the diverter valve needs replacing. Check this link and look under DV for an explaination:

http://www.elitedubs.com/index.php?topic=988