Hello! Ive bought this volvo, and ive been playing around today. boost is dropping off around 4500rpm. Twin piston dump valve is open on idle, altho when I take it off and refit, it will only open a lil bit then after a few revs, its wide open, so after furth mooching about, ive found a grey check valve coming from throttle body is gooswd, I can blow down it feom both ways. Would this cause the boost drop at 4500rpm? Anyone know where I might find one urgently. Im in teeside area.. Cheers.
|