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Idle control valve cleaning & adjustment of stop? 900 1993

posted by  SLong on  Sat Oct 28 13:30 CST 2006
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last visit: Thu Oct 23 19:52 CST 2014
[RELATED]

I have a 1993 945T. I took a look at the idle control valve today and have some questions. The valve was somewhat stuck, but after cleaning with throttle body cleaner it moves fairly well. Something that was odd is that when the valve is closed (aganist the stop), it appears to be closed too far such that air can pass though it. Rotating the valve about 1/8th of an inch prevents air from flowing through the value. Moving it further opens the valve, as it should. It looks like the stop was adustable and set at the factory. Now it has a locking epoxy (?) preventing adjustment. Should the stop be adjusted so that the valve is actually closed or is there some other reason that it should permit the passage of air when on the stop?

My car has somewhat of an unsteady idle, which is why I took a look at the valve. I also just cleaned and adjusted the throttle body.

Could someone explain the signal that the idle control valve gets? Is it just 12V or 0V, or does the signal range from 0-12 volts (eg 0, 1, 2, 3, 4, 5, 6, 7...12V)? Is the valve either open completely or closed completely, or is it variable?

Finally, what lubricants (if any) should I use on the valve?

Thank you,
Steve
--
1986 745 w/ M46 200K since new, 1995 965 104K






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