Date: Tue, 20 Oct 1998 11:13:43 +0100
From: RCS <e9225126nopsam1.tuwien.ac.at>
Subject: Re: '89 900 5 spd - low throttle miss


First you have to determine the version of your ignition/fuel system. Is there an automatic idling control valve with 2 or 3 electrical wires? Is there a throttle angle potentiometer or a low- high switch (which are often corroded...) - check function with multimeter, and replace switch, when needed (not 0 Ohm - infinite). Does the engine stall after full power too? (power-clutch-correct idling?) The system is very complex, cause itīs auto-adaptive and "learns". But only if all sensors and switches are fine! Otherwise it learns bullsiht! Most of the 900 have problems with the idling control valve or the throttle switches! strother > I need help with a problem the dealer can't seem to find. > > I recently purchased an '89 900 5 spd w/ 49k miles. A great car, but > it > suffers from the following problem. Most of the time it runs fine, > but > occasionally the engine will miss, not continuously but sporadically > as if > this is an electrical or vacuum advance problem. The "Check Engine" > lite > does not come on and the engine idles fast (1300 rpm whether the a/c > is on > or not). Here's the catch... if I turn the ignition of for a second, > the > idle returns to normal and no more skipping...until the next time. > Occurs > about every other day, usually during a stop-and-go 26 mile commute. > Missing usually happens just off idle. > > The dealer has checked the engine and, as expected, the problem never > shows > itself there. > > The vehicle had been sitting for a while before I bought it and the > dealer > replaced the air volume meter. > > Any ideas??? > > Thanks, > > Ron

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