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Idle Problems
Posted by donrazr (more from donrazr) on Fri, 20 Sep 2002 03:39:38
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00

Vehicle- 1984 Saab 900 Turbo 246k mi Symptoms- Ambient temp below 80
degrees F, cold start is pretty good except for some stumbling after about
four seconds Ambient temp 90 degrees F or above, 'cold' start is very bad.
Engine stumbles badly but then will idle ok after driving for a few minutes.
Regardless of ambient temp, on a hot restart, idle is very poor, stumbles and
it is difficult to get the car moving in first gear. Attempts- Disconnected
hoses from aux. air valve with engine 'cold'. (Ambient temp about 90 degrees
F). Opening was a slit at most one millimeter wide. Ran fuel pump for
approx. three minutes and the opening completely closed. Checked the
resistance between the two terminals on aux. air valve. It was 42 ohms which
is within specs per Bentley manual. Put aux. air valve in the freezer until
fully open. Installed, and engine idled perfectly. Can I assume from all
this that the aux. air valve is not opening up as much as it should at higher
ambient temps? I will greatly appreciate any insight.

Don Walter
Tucson, AZ
78 Saab 99 Turbo 165k mi.
84 Saab 900 Turbo 246k mi.
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