Intermittent missing problem - Saab 900 Bulletin Board - Saabnet.com
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Intermittent missing problem
Posted by Bill N [Email] (more from Bill N) on Mon, 22 Jul 2002 21:43:53
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'87 900 Turbo.
The car has gradually developed an intermittent problem. When it occurs, the idle is unstable (300-2000 rpm), the car misses intermittently while driving, and the tachometer twitches upward. The tach twitches do not appear to correlate directly w/ misses. The episodes with the problem are getting more frequent and the missing/rough running is more severe.
I've done the normal things for unstable idle (clean AIC valve, throttle body, eliminate vacuum leaks, etc.) The AIC valve works fine on another car, and a good AIC from another car doesn't change the behavior on the '87. The throttle position switch works properly.
I replaced the plugs recently w/ no affect on the problem.
Any thoughts on things to check would be appreciated.
posted by 216.150.208...
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