I have a 1993 945T. I am posting this message on the 700 board as well because the idle control valve is the same in later cars. I took a look at the valve today and have some questions. What seems 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? How do I get the epoxy out? Heat it?

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
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1986 745 w/ M46 200K since new, 1995 965 104K