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245 correct idle after start but high after use 200 1992

posted by  OwenF on  Sat Oct 3 04:11 CST 2020
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last visit: Sat Jul 7 13:55 CST 2012
[RELATED]

This may be completely irrelevant, but I'll post it for information.

My 1991 940, B200F with LH 2.4 and M47 also idles high after I have run the car over 60mph. The reason appears to be that I no longer have the speedometer signal going into the system. I had to replace the Yazaki Speedo due to the well known issues with the capacitors. The car idles perfectly at around 750 rpm until I take it over that speed, then it idles at circa 1100rpm. To correct this I simply have to switch off and switch on again. This restores the correct idle. I can't understand the logic of why the ECU should be set up like this, but presumably Volvo did this deliberately. Prior to my removing the speedometer signal of course it worked as it should, idle returning to normal after a fast run.

Ian F






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