Quote:
Originally Posted by IMR-Merlin
Are you verifying that the engine and ECU are seeing the same temp reading?
So, what you are saying is that the car starts fine, idle "normal" for a couple minutes, then the idle drops to 650?
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It drops to 650 because the fast idle valve is stopped being supplied power.
The mystery is why the RPM increases.
Sounds like the idle valve is creeping back open. That'd be easy to test. Should be no power to it when warm.