Idles high when first cranked and then drops to a rough idle.
My 1999 Ford taurus idles high when I first crank the car, and then when the idle drops, it
drops to a very rough idle. The idle is so rough that the car will sometimes go dead. How
can I fix this issue, or what do I need to check?
Get a can of throttle body cleaner and remove throttle body and totally clean it. Remove Idle air control valve, tear it down and clean it also. Or buy a new IAC. Clean MAF with special cleaner also. Can buy both at any auto store.
Check the resistance across the IAT sensor. Inlet air temp sensor. It should be around 30,000 ohms. Mine showed no resistance(open) but if I softly moved the sensor element it would work and show resistance. This will shake and open up under normal driving conditions and give the engine no temp signal which would give you a rich fuel mixture. Good luck.
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