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idle air control valve ( IACV) 900

posted by  Mike91 on  Sun May 19 20:10 CST 2013
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last visit: Wed Sep 17 19:52 CST 2014
[RELATED]

What vintage of 900 is it ? I have a 1993 940 with Regina fuel system. The car sometimes stalled unexpectedly and reported a 2-2-3 code for signal missing to IAC valve.

I removed the IAC valve and tested with a variable power supply. Increasing voltage causes the internal cylinder to move. 2.9v would (correctly) mean the valve is partially open. If your IAC valve looks dirty it should be safe to remove it and clean it with throttle body cleaner.

In my case the problem was the electrical connector. Cleaning the 2 contacts in the IAC valve and on the mating wire harness connector eliminated the stalling problem.

Make sure all the hoses to the IAC valve are in good condition with no splits at the ends. Even a small leak can affect the idle quality.

Regards,

Mike






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