Originally Posted by Gper4life

I know this is beating a dead horse. I've read and read and read about it, but can't seem to get my questions answered. So here's the skinny.

I recently purchased a used 90 model XJ. It has the usual 4.0/auto. It hard to start and usually requires a little assistance from some starting fluid at first. Once it fires it will run just fine, except the idle is out the roof. I have cleaned the throttle body, and replaced the IAC. The problem lies where the IAC port is on the throttle body. Something is or isn't telling the IAC to go far enough out to stop the air from coming through the hole the pintle is supposed to be in. I took an old IAC that I had laying around and broke it so I could manually set the pintle. With the idle set manually this way, I unplugged the one I had broken and plugged the new one in just to verify that it was working correctly. It is working but it will not go all the way out to where it should be. If you turn the key off, the IAC will reset by spinning itself back to a certain point. So I have no doubt that it's not working. I did replace the ECM just for giggles to make sure and eliminate that part of the equation. Is there anything that could cause this? Or are there any suggestions you guys might have that could remedy my problem?