The "idle control valve" is the part that the manual refers to as the "air slide valve" which is nothing more than an air pump that functions as I described it earlier in this thread. If the idle goes up, it could be a variety or things like the controller. The idle speed has inputs from the air conditioner too. To really diagnose it you need a break out box and know how to use it.

I took that problem to a dealer before I learned to fix it myself and the dealer said "it is hard to diagnose and we usually have to replace a lot of parts and people don't want to pay". I said "that's me exactly". The dealer said "I will take a pass on that job".

If you want to do any work yourself, buy the manual because it will save you a lot more than it costs and then you will be equipped to do the work. Without the manual, it just takes too much to walk through it.

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Steve
1985 Mercedes 500SL Euro (Gray market)
1995 BMW 520i Euro (Gray market)
1992 BMW 525it Wagon
1994 Honda Del Sol Si