Dave Petryk described a procedure that uses a screw to adjust the idle speed produced by the idle control valve in the following thread:

http://www.peachparts.com/shopforum/sl-forum/243090-idle-speed-air-control-slide-valve-confidence-check-2.html

I was going to try this to reduce my high idle, since I've tried everything else, including changing the ICU, checking for vacuum leaks, adjusting the linkage, etc.


However, I assumed that the rubber ring this screw goes into was empty and threaded, but it isn't. The ring has a little brass cap in it. So, before I ruin my ICV, I was wondering if you change the idle by using this screw to push the brass cap down?

Thanks very much for any help anyone can give me on this procedure.