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When starting from cold, the idling speed should increase to well over 1000 rpm and your engine is not doing it.
The Idle Air Control (IAC) Motor located on throttle body is the main part controlling this and quite often when it is dirty, stuck or faulty, the problem would occur.
Quitte often cleaning the IAC, throttle body and readjusting the idling speed would resolve the problem
Here are procedures for testing the IAC.
IDLE AIR CONTROL (IAC) MOTOR
1. Disconnect IAC motor connector. Check resistance between IAC motor connector terminal No. 2 and either terminal No. 1 or 3. Also check resistance between IAC motor connector terminal No. 5 and either terminal No. 4 or 6. Each resistance should be 28 - 33 ohms at 68 F (20 C). If resistances are not as specified, replace IAC body assembly. If resistances are as specified, go to next step.
2. Engine coolant temperature must be 68 F (20 C) or less. If not, an Engine Coolant Temperature (ECT) sensor that is appropriate temperature can plugged into ECT sensor connector. Turn ignition on (engine off) and listen for IAC motor operation sound. Operational sound should be heard when ignition is turned on and off.
Tuesday, October 20th, 2009 AT 10:06 AM