Date: Thu, 11 Nov 2004 19:59:40 +0100 From: "Felix Holm" <felix.femkenospamet.nl> Subject: Re: 900 T16 1989 Turbo problems
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
 |
 |
 |
 |
 |
