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Re: Poor Idling When Warm
Posted by Francis John R. - http://saabnet.com/tsn/forms/e.p (more from Francis John R. - http://saabnet.com/tsn/forms/e.p) on Fri, 5 Dec 2003 22:20:56
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

>It generally runs smoothly when cold, but the warmer the engine gets,the choppier the 
>idle gets, until in worst cases at full temperature, it seems to bechugging along on 
>less than 4 cylinders. 

Go ahead and check your oxygen sensor, Derek, but this sounds more like
a temperature sensor to me, especially if it runs fine when cold.  It
sounds like the sensor is stuck in the cold reading, so it's still
telling a warm engine that it needs a richer mixture.  Do you notice
some black smoke coming out of the tailpipe when it is at its worst?  It
seems to me that Bentley has a test for the temperature sensor - I think
its resistance increases or decreases with temperature.  It probably has
a default setting it goes to if you unplug it.  That's what I'd try.
Not sure on the 9000, but on my C900 the temp sensor is right beside and
almost under the thermostat.  Good luck with it!

John Francis
1984 900T  308,000
1987 900S  180,000
1990 900   125,000
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