Quote Originally Posted by zaut View Post
EagleMark, You may be correct with the IAC Valve. I finally got a PC connected to the car. The target idle was 600 rpm and the engine was running at 850 - 900. The IAC count was 59. I shut the car off and restarted and the idle went down to 600 and counts were 37. When the IAC hangs, does the counts hang as well? I would think the ECM would pulse the IAC to change and count those pulses, regardles if the valve moves or not. I did not think the IAC gave any feedback of its actual position.
Like Robert said... seems we are finding more and more IAC issues lately or guys are just beginning to see idle issues and notice IAC counts? I think the count is going up because the ECM is commanding more but the valve is not moving or getting stuck in the move?

The one I did hands on last week did the same as yours. I still have the bad IAC here and going to tear it aprt to see if it is stripped? Or if I can see what is happening... I think 30 year old IAC are just wearing out!