I drove the '90 Reatta over 40 miles yesterday. This morning, the car would not start.
I was going to adjust the headlights this morning. When I opened the hood, I heard ticking noises (the car was cold). I went and tried to start the car,...dead.
I recharged the battery and took the car to the mechanic. He said the problem is the IAC. He replaced the original IAC a few days earlier. The next day at his shop, he was going to replace an oil pan gasket (he had the car on a lift from the day before). He popped the hood and heard ticking. Went to turn on the ignition,...dead battery. He determined it was the IAC ticking and draining the battery. He replaced the new IAC with another new IAC. I took the car home last Friday afternoon, didn't drive it until Saturday night. Drove it again on Sunday. This morning as I popped the hood to adjust the headlights, I heard the ticking and...dead battery.
Mechanic thinks I should replace the ECM (of which I have one en route) for this and other reasons surrounding idling issues (isn't that the job of the IAC?). He feels the ECM is not communicating with the IAC. Question is...could there be a short somewhere and if so, how do you determine where it is? Installing another ECM, if there is a short, solves nothing.
There are no vacuum leaks and the TPS has been replaced. EGR is fine. There are no error codes. This has become frustrating in what I feel isn't a difficult problem to solve (I wish I was mechanically inclined). Any suggestions are appreciated.