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Date: Thu, 11 Nov 2004 22:26:30 +0100
From: "OKOK!" <rootnospamlhost.com>
Subject: Re: 900 T16 1989 Turbo problems


Felix, I have the manual ("Vraagbaak" :-) ) in Dutch. Can look up some things for you, or send some scanned pages. The AMM check is in that manual. Where are you located? I am in Utrecht. Richard. "Felix Holm" <felix.femkenospamet.nl> wrote in message news:cn0cr2$2lr$1nospamer13.wxs.nl... > Hello, > > >>> 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. > > This is what it always did. So there has nothing changed. > > >>> 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. > > It feels like some valve/sensor is blocking the boost at low revs. > It also feels like it accelerates with little, hardly noticable, hickups. > Like if a regulator is gradually allowing more boost as the revs go up. > Difficult to explain in a foreign language :-) (I'm Dutch) > See below.. > > > >> 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? > > Throttle position sensor. > The switch that tells how far the throttle valve is open. > > > > >> 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. > > What is the AMM ???? > Air Mass Meter???? > I have an ohmmeter. > Tell me where and what to mesure please. > > > Grtnx Felix > >

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