Date: 9 Nov 2004 21:40:40 GMT
From: Dave Hinz <>
Subject: Re: 900 T16 1989 Turbo problems

On Tue, 9 Nov 2004 22:27:24 +0100, Felix Holm <> wrote: > Hello, > > I have a 1989 900 Turbo 16v with the following problem. > > When driving away my Saab is lacking power. It used to deliver more power > when driving at low revs. > At low revs (2000 rpm) I hear the turbo spooling up, but it is not > delivering power. > When I am at full throttle it's power delivering is normal. Where does the needle go on the boost valve? Into the red, or just yellow, or white? Is that down from normal? > > So I thought it has nothing to do with the Turbo itself. Unless your turbo is making whiny, grindy noises, yes, it is unlikely to be the turbo itself but rather something telling the pressure to be reduced. > Is there any "valve" or "switch" that can block or regulate the building up > of presure from the turbo? Yes, any number of things can open up the wastegate, making you lose top-end power. Easiest would be something physically rattling in the engine compartment, making the engine management (APC system) think you are having predetonation (ping) and backing off the boost. Do you have any rattles? How about air leaks? did it get worse all of the sudden, or gradually? > I didn't find any air leaks in the vacuum system. > Can somebody help me please..... We'll get there, there's really not too much that can go wrong in that area, and most fixes are inexpensive. Dave Hinz

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