erratic idle - Saab 900 Bulletin Board - Saabnet.com
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erratic idle
Posted by Paul Willis [Email] (more from Paul Willis) on Sun, 21 Apr 2019 17:27:56
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I have an erratic idle that is not due to a vacuum leak I am pretty sure. 1991 900 turbo. Now that it is getting warmer the idle forgets to set at 850 and will drop momentarily to maybe 500 and then wake up and get back to 850-1000. It always hunts a little. When it was cold out it was less of an issue. Now sometimes it will not restore the idle and it will die.
Not sure if it is the AMM, the AIC valve or the ECU that can't keep it straight. The thing is that it sometimes works great, and then 10 minutes later stumbles and either almost saves it or lets it drop and die. If the AIC valve were screwed up I think it would do it all the time. It used to do a thing when the car was warm on a hot day and setting after driving, it would not hold idle till you drove it a bit. That went away as it now does it sporadically.
Thoughts? I can her the AIC valve pulsing. I think maybe the ECU is getting cranky or maybe the AMM is not quite right. Weird thing is that off idle it runs great. Thanks
posted by 99.198.22...
Posts in this Thread:
- erratic idle, Paul Willis, Sun, 21 Apr 2019 17:27:56 <-- Viewing This Message
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