Originally Posted by lcstyle

most of the IAC valve problems are simply the unit getting stuck, because of the black deposits that you can clearly see. A little carb cleaner should unstick it and get it right back working again. worked for me on other cars, don't see why it shouldnt work on the CL. Also, in your case the actual servo / motor assembly could have been burnt since the gradual resistance that is imposed by the buildup of deposits, so it might actually have needed to be replaced.