Date: Tue, 09 May 2000 18:56:13 +0200 From: RCS <e9225126nopsam1.tuwien.ac.at> Subject: Re: engine stalls on 900T16
No, I donīt think so, (TIM)! ;) The thing with the engine rest might be, but the 1990 900i 8v had not a hydraulic rest, and the 900i has also no AIC system, APC... etc. This is only for the 900 2,0l turbo 1989-1994! Greetings, RCS Jan Nijboer: > Hm, this sounds remarkably familiar. My 900i (8v, 1990) has the exact same > thing, but stops doing it after the motor has warmed up. > Any ideas why it does that? > > Jan > > RCS <e9225126nopsam1.tuwien.ac.at> wrote in message > news:3917183A.C433180nopsam1.tuwien.ac.at... > > The same problem every time on the 900! Iīm absolutely sure that itīs the > same > > thing! > > > > Originally this problem starts at the front engine rest (sometimes the > rest also > > breaks, you īll only notice that at an awful cruise driving at idle 1st > gear) > > thatīs too weak and allows a too large up/down movement of the engine > against > > the chassis. > > Thatīs the reason why the air intake pipes in front of the engine right > after > > the radiator get loose or rub against other parts. After some years there > are > > holes at the air intake pipe (at my car even a screw of a pipe connetor > worked > > through the alloy pipe!!!). > > > > The air mass meter that tells all other components what to to is located > in > > front of this holes so the metered air mass is wrong. That confuses the > control > > of the AIC valve (Automatic Idling Control valve, a bypass of the closed > > throttle plate that keeps the engine running when the pedal is released). > The > > engine stalls when you release the pedal after normal driving (traffic > light, or > > it works better when you rev higher and abruptly release the pedal ) cause > the > > throttle closes and the AIC opens, opens, opens until itīs closed on the > other > > side. > > > > Sometimes also the AIC valve itself gets dirty and sticks but you can see > this > > only when you drove on highways for a longer time and the idling is much > too > > high when you left the highway. > > But over 90% there are leaks in the air intake pipes that cause rough > starting, > > and unstable idling especially after starting the car like 3000rpm down to > > nearly stalling, 2800 rpm down to 500, up/down.... > > > > If you donīt know this itīs difficult to find it cause the engine > management > > system is adaptive learning. You can change or adjust anything, everything > is > > fine for a while cause every part is running in safe limits and adjusts a > new > > operating point - then happens the same again. I have a very good SAAB > mechanic > > but it took us nearly half year to locate the exact problem! Never change > any > > part if you are not 100% sure itīs faulty (and itīs never the expensive > APC > > unit), itīs no mistake to change the AIC potentiometer/switch cause it > fades > > anyway. > > > > Greetings, RCS > > 1993 900 turbo convetible > > > > > > Werner : > > > > > I have noticed the following problem on my 1991 900T16: when driving > very > > > slowly (city driving) or idling the engine sometimes stalls ans shuts > off (I > > > see the revs go to zero). Same problem when I start the car: the revs > go > > > up, drop to zero and the engine tries to keep the engine going and it > does > > > most of the time. I suppose it has something to do with stationary > idle. > > > Someone told me to take out the little part (don't know the name of it) > that > > > controls the stationary idle and to clean it and I did but no much > effect. > > > How do I know if this part is broken? Any way to check this? Or should > I > > > go and look for other causes like problems with the APC box? > > > On the other hand I have no problems when driving at normal speeds, only > > > when slowing down for traffic lights or in city driving the engine > sometimes > > > shuts off. > > > > > > Any comments greatly appreciated! > > > > > > Thanks, > > > > > > Werner > >
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