Classic Saab 9-3/GM900 (1994 - 2002)/Conv ( -2003)
The dump valve on my 2001 9 3 2.0T coupe was replaced six months ago by an oe unit after the check engine light came on and I noticed a strange chirruping (?) noise when releasing the throttle.
All was well but 2 months ago I upgraded to stage 1 (225bhp, Maptun) and the same symptoms have...