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Date: Tue, 9 Nov 1999 18:27:46 +0100
From: "naranja" <naranjanopsam.jet.es>
Subject: RE: Cold Idle Adjustment 89 900s


SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT SEAT RCS <e9225126nopsam1.tuwien.ac.at> escribió en el mensaje de noticias 3826B113.AC70E86Fnopsam1.tuwien.ac.at... > Thatīs true! Thereīs a fail safe function that revs the engine higher to > prevent stalls- seems you fell into it! The automatic idling control valve AIC > is a very common problem on the 900t itīs a bypass of the throttle plate to > keep air flowing into the engine when the trottle is (almost) shut. > Itīs controlled by the APC and Bosch engine management system. > But thatīs only one reason. > The other effect is that very often the air intake pipes got leaky (front end > of the engine close to the radiator) and "suck wrong" air. The airmass meter is > before those pipes and the air forced into the engine differs form the metered > volume. So the engine management unit gets confused. > The problem about this is that the system is "learning" and tries to compensate > this - so when you change any adjustment - it may be compensated and itīs very > difficult to say whatīs happening... strange stalling effects at idle are > common! > > If it worked before: donīt change anything! Clean the AIC valve and check > function (maybee replace it) and carefully (very carefully!!!) check the air > intake pipes, they are very, very often leaky, always somewhere where you canīt > see it! > > Greetings, RCS > 900 tconv MY1993 > > Eric Law wrote: > > > Unless you're heavily into computer programming, you can't. It's > > automatically controlled by the fuel-injection computer. > > > > The actual component that regulates the idle speed goes by various names, > > usually "idle valve" or something like that. Probably what is happening is > > that when you start the car, the computer is telling the valve to open (= > > higher RPM), and it's getting stuck there. Cure probably is a new idle > > valve. > > > > Eric Law > > > > Aaron King <a949kingnopsaml.msn.com> wrote in message > > news:eOUomDjJ$GA.338nopsamnbbsa05... > > > Does anyone know how to adjust the cold idle on an 89 900s? Mine runs at > > > about 2200 rpms and the noise and fuel consumption is getting very old. > > > > > > >

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