'90 900S Intermittent High Idle and No Restart - Saab 900 Bulletin Board - Saabnet.com
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Have a customers '90 900 in the shop that I can't figure out. Car starts, runs, and idles fine for the first 5 minutes or so, then the idle becomes erratic and jumps to around 3k rpms. It will sometimes drop then begin to idle high again. The car has a new IAC valve and I attempted to put a new LH ECU in it today, but the replacement unit is bad and will not start the car at all.
If you rev the engine at all when the idle is high it wants to stall.
After you shut the car off, it will not restart. Wait a few hours and it will restart and do the same thing again.
Watch the attached video and let me know any suggestions you may have. Thanks in advance!
-Chad
900S High Idle and No-Restart
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