Bucking and stalling - 93 n/a - NOT DI - Saab 9000 Bulletin Board - Saabnet.com
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Bucking and stalling - 93 n/a - NOT DI
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Posted by Kappy (more from Kappy) on Sun, 30 Mar 2003 16:42:05 Share Post by Email
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1993 CS non-turbo. 127,000 miles. Symtoms are:

1. Very low idle ~500rpm;

2. bucking/missing on acceleration, especially on sudden or sustained acceleration;

3. Stalling if sitting at idle when motor is warm;

4. Sensation of less power;

5. Intermittent check engine light

6. Stall and will not restart right away;

7. Starts fine on cold start;

8. Except for intermittent bucking and overall feeling of less power, motor is smooth.

The only thing I have attempted is swapping the DI cassette with a known good unit. I have not yet pulled the plugs.

I was thinking it could be the fuel filter, fuel pump or the fuel pump relay, but the car starts fine when it's cold and holds 1000 rpm idle for a few minutes. Is there any reason why the fuel system would be ok for a few minutes and then not ok? The gas tank is almost full and I was thinking it could be a tank of bad gas, but why would it start fine and run smoothly on an intermittent basis if the gas is bad?

The AIC valve is 2 years old. I tend to think it's not this valve since I am having trouble on acceleration as well as at idle. The AMM is original and I am not sure if I have ever cleaned it.

Any thoughts or similar experiences would be much appreciated.

Kappy

posted by 24.50.58...

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