Date: Thu, 11 Nov 2004 09:49:40 +0100 From: "Felix Holm" <felix.femkenospamet.nl> Subject: Re: 900 T16 1989 Turbo problems
"Dave Hinz" <DaveHinznospamcop.net> wrote in message news:2vcrqoF2ka4vuU1nospamberlin.de... > On Tue, 9 Nov 2004 22:27:24 +0100, Felix Holm <felix.femkenospamet.nl> > 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? In boost the needle goes to the end of the yellow zone, not into the red. >> >> 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. No, it's not making any strange noises. What I noticed was that the engine is strugeling to deliver the power. Reving the engine is hard work, and the engine makes more (not strange) noise. > >> 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? The strange thing is that I don't lose top-end power. It's just the power in the beginning. When I press the pedal down it takes some time (much longer than it used to) to give me pressure, although the turbo is spinning. On the gauge it's not building up pressure at that moment. Later on it's building up normal. So it's really the low-end power I'm missing. I lost my power all of a sudden, not gradually. Strange thing is that it came back sometimes after I turned the TPS a little bit. But that lasted no longer than a week. I hope this gives you a bit more information. > >> 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. I hope we find the solution Grtnx Felix > > Dave Hinz >
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