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Date: Sun, 14 Nov 2004 20:23:03 +0100
From: "Felix Holm" <felix.femkenospamet.nl>
Subject: Re: 900 T16 1989 Turbo problems


Hello, I just bought the Official Service Manual. It's always better to have something in Dutch :-) Please mail me a scan of some test to do for my problem (AMM, AIC, Wastegate). Thank you very much!! Bedankt, Felix "OKOK!" <rootnospamlhost.com> wrote in message news:4193d909$0$46385$cd19a363nospam.euronet.nl... > 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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