Re: erratic idle - Saab 9000 Bulletin Board - Saabnet.com
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Re: erratic idle
Posted by shawn (more from shawn) on Thu, 3 May 2001 23:39:55
In Reply to: erratic idle, vit, Thu, 3 May 2001 22:47:46
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http://www.escribe.com/automotive/european/tsn/m13791.html
go to this survey it says the following...as i see your post 1,000,000 times...
cold idle and stalling: 100% of the '85-early '88 owners report an unstable
idle. The infamous "cold idle" problem occurs when starting a "cold" engine
during temperate or hot weather: the engine RPM oscillates around the
proper idle speed (around 850 RPM) by reving up as hig! h as 1500 RPM;
coming down so low as to almost cause a stall; then reving up again.
Usually this extreme behavior disappears within 30 seconds. This behavior
is symptomatic of an air/fuel mixture that is actually leaner than the
sensors think it is. T! he cause of the problem could be as simple as a
pinhole leak in an air hose or as expensive as an aging sensor that is too
far out of calibration. Rarely is the engine computer itself at fault.
Unfortunately, it is very difficult to diagnose the exact ! cause, since
one's mechanic can make an "attempt" only once per 12 hour (or so) period.
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