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Date: 11 Nov 2004 15:28:06 GMT
From: Dave Hinz <DaveHinznospamcop.net>
Subject: Re: 900 T16 1989 Turbo problems


On Thu, 11 Nov 2004 09:49:40 +0100, Felix Holm <felix.femkenospamet.nl> wrote: > > "Dave Hinz" <DaveHinznospamcop.net> wrote in message > news:2vcrqoF2ka4vuU1nospamberlin.de... >> 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 you're getting only basic boost then, I think. >> 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. Good. So mechanically we're sound then, it's just an engine management problem. >> 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. That's puzzling. > 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. What's a TPS in this context, please? > I hope this gives you a bit more information. I wonder if your AMM's internal adjustable resister is the next thing to check. Do you have an ohmmeter? Anyone else want to jump in here, I'm not getting a good picture of it yet. Dave

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