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1991 940 idle issue

posted by  OwenF on  Wed Jan 23 06:29 CST 2019
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last visit: Sat Jul 7 13:55 CST 2012
[RELATED]

My 940 (945 wagon) is a UK spec car with a B200F engine - 2 litres, non turbo.

I've got a minor issue with the idle speed. Normally starts and idles at around 750 rpm, very stable. After a run along a motorway at 70 mph or so, the idle settles back to around 1100 rpm. However if I switch off and switch back on again immediately, the idle is back down where it should be at around 750 rpm. So it seems that a high speed run is making some change to the engine which can be immediately cancelled by a re-start?

I have cleaned the throttle body and the idle air control valve, and checked that there are no air leaks in the induction system.

Any ideas please? Not sure whether it is inconsequential or an indication of something which I should be dealing with?

Many thanks

OwenF
Scotland






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