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Volvo RWD 200 Forum

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posted by  Trev29 on  Mon Sep 24 05:32 CST 2012
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last visit: Fri Oct 17 05:56 CST 2014
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I'm not familiar with the intricacies of IAC valve operation, but Art did write, "To oversimplify it, the idle speed regulation occurs in a feedback loop. The RPM signal from the crank sensor is passed by the ICU to the ECU which uses it to control the "on time" or duty cycle to the spring-loaded idle valve...".

Art suggests that using a dwell meter would help find the problem.

Myself, I thought that IAC valve operation was just an open/close operation. Didn't think that voltage to it was being varied to adjust the size of the opening. (Carburetted systems are much simpler.)
--
1980 245 Canadian B21A with SU carb but electronic ignition and M46 trans in Brampton, Ont.






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posted by  anthony2  on Fri Sep 21 23:31 CST 2012 >


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