Date: Thu, 05 Nov 1998 10:11:24 +0100
From: RCS <e9225126nopsam1.tuwien.ac.at>
Subject: Re: saab 900 stalling problem, 1989


Hi I had the same problem on a 900 turbo convertible, and it turned out that the throttle angle switch was corroded (MY93). The car was running fine, but when you depressed the throttle full (speeed ,speeed...) and then applied the clutch (traffic light, corner) the engine stalled. The system is autoadaptive that means it learns a lot of bullshit when the sensors donīt work. When you change something itīs always on the safe side, but then it adjusts itself to the "ideal" point - what may be the wrong point. You have the same problem with the AIC idling controll valve on the turbo. So in a lot of cases the stalling is caused by the NOT recognition of the closed throttle, cause the switch should have 0.0 ohm and mine had about 50~70ohm. Another thing could be the "boost bypass valve" that may not open. Think from the turbo side (pressure, pressure, closed throttle, ????). Ok, check the switches! -Roland- kcwongnopsamsplanet.net schrieb: > I have a 85 Saab 900, and I have exactly the same problem. As long as > > the car is running, its fine. But whenever it stops, or when I take > > my foot off the gas, the RPM would drop right down and the engin > would stall. This happens when its cold or warm up. And when the car > > is idling, after a while it will stall as well. I also had the idle > adjusted, it worked fine for a few weeks, then it start stalling > again. If anybody have any ideas on this problem, please advice. > Thanks ! > > On Tue, 3 Nov 1998 10:46:03 +0100, "Lisa Johansson" > <ofa7651nopsamet.se> wrote: > > >Hi! > > > >For me it sounds likt the ignition-module. > > > >Thomas > >Jooon skrev i meddelandet > <19981031191029.06765.00002005nopsam7.aol.com>... > >> i have an '89 saab 900 (not a turbo) that has a stalling problem. > it's > >>really, really elusive. i keep getting different things fixed and > it will > >then > >>work for a while, then the problem reappears. sometimes it stalls > as the > >rpms > >>are decreasing once i let off the gas. sometimes the engine just > cuts > >while > >>cruising along at anywhere from 2,000 to 3,000 rpms. sometimes when > the > >>engine's cold, usually when it's fully warmed up. > >> > >>so far, mechanics have: cleaned the fuel injectors, adjusted the > idle, > >>replaced some charcoal hose and replaced the oxygen sensor. all > those > >things > >>have worked for a while, then like i said, the problem starts again. > > >mechanic > >>thinks the problem could be the computer that controls the rpm > levels, but > >he > >>doesn't want to do a $500 repair on a theory. > >> > >>any advice? > >> > >>thanks in advance > >>june > > > >

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