I can agree that if the ECM commanded a move, it would assume it was made (no feedback). The count would be what the ECM thinks the IAC is at. However, (please correct me if I am wrong) the counts are not absolute. The ECM counts up and down. What I have seen is low counts meant the IAC was closed or low idle RPM, and high count meant the IAC was open. I would think that I should see a very low count when the IAC was stuck open and the ECM was trying to close it. The data I am missing is what are the "normal" counts for the IAC at any one RPM. Maybe 59 and 37 are very low counts, below what should be normal. I guess I have to make a $50 gamble on a new IAC or keep looking to see if it is anything else. Since my engine is highly modified, I am guessing no one can say what the normal count should be for my configuration. And YES my IAC is 27 years old so it could just be tried. One thing I have noticed since I completed the rebuild was that at cold startup, until a fixed amount of time, the IAC would stay at a fixed number, I think 150. Is that normal? Is there a way to adjust that?
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