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Re: High Idle 1990 Regal Custom 3.1
UPDATE - Problem Solved
This one had me going for more then two months. In a fit of rage, I just started unplugging sensors one by one until something changed. Finally when I yanked the Coolant Level Sensor (CLS, the one in the radiator) the idle jumped up, then lowered to ~800. I knew I had found something. I reviewed the scanned data recorded during the test and noticed some funny things happening to the 5 volt reference supply from the ECM. I then disconnected the battery to reset the ECM - with the coolant level sensor disconnected, and reconnected the battery leaving the CLS unplugged. I restarted and let the ECM relearn and that solved the problem. It appears that the CLS was intermittently shorting and causing the ECM to go nuts. I hope the information can help someone else.
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