High Idle on '89 Turbo - Saab 900 Bulletin Board - Saabnet.com
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High Idle on '89 Turbo
Posted by Mac [Email] (more from Mac) on Wed, 1 Aug 2001 15:43:46
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Am having continued high idle problem on '89T. Thought it was fixed several times but comes back after a few weeks. Car idles at about 2000 RPM; may drop to about 1750 and go as high as 2250 or hunt between but usually holds at 2000 RPM. Have checked vacuum lines, replaced idle valve, cleaned electrical connections to idle valve, checked and replaced some of the rubber grommets in the intake manifold, and cleaned all air induction components. While trying to troubleshoot, noticed that if I disconnect electrical wiring to idle valve, idle immediately drops to about 800 RPM; it will stay at this level when I plug wiring back into valve as long as I don't shut the engine down. If I shut engine down and restart, idle is again high. Anyone any ideas?
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