The more "open" pulses the more air the valve lets in and the idle goes up.
When it is at idle that valve stays really close to closed with the ECM sending a pulsed signal to it to open it sort of like this (Closed = _ open = ) _ _ _ _ _ _ ). There is the problem Both of those are the other design with the spring loaded valve. Do you have any further suggestions/guidance? You mention there are two different valve designs? How can I tell which one is for this car? I am tempted to adust the idle manually and leave the IAC unplugged. I have checked the IAC and it is not a brass model, and the spare I purchased is a brass model and when I plug the brass one in, the rpm goes nuts, so I am guessing it is the one for the other engine? The original IAC was thrown out last year so the one I have been running on is supposedly the correct one? I noticed the brass one has a stamped Roman numeral I stamped inside the chamber and the one without the brass insert has a Roman numeral II. But when I drive down the road with it unplugged, the sticky throttle problem goes away entirely. If I unplug the IAC the idle drops a little bit with no climate control on and in Park, and with it on it almost dies when the AC clutch kicks in every ten seconds or so. After pulling and shorting battery cables there is better idle, less frequent hunting of rpm in Park and gear with brake applied and doesn't go so high as before when turning on the climate control, but the sticky accelerator issue is still there.
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