Locate the Idle Air Control (IAC) valve and verify that there is good hot coolant flowing to the valve. The valve has a built-in thermo element to open the valve further when the engine is cold.
2. If the coolant lines are good and hot, locate the 3-cavity connector on the IAC valve. The Yellow/Black (Y/B) wire is the ground for the closed windings of the valve. Back probe the Y/B wire and with the car running ground the wire, the idle should slow way down and possibly stall the engine. If it does not slow way down, look for a sticking IAC valve.REMOVE IAC VALVE, CLEAN WITH CARB. CLEANER, ACTUATE VALVE WITH A POWER PROBE TO OPEN AND CLOSE VALVE. REINSTAL.
1. At the idle speed control valve, use a volt meter to measure the voltage on the open and close winding. The open winding should be approximately 3 volts cranking and 5 volts when the key is released. The voltage should slowly climb towards 7.5 volts. The close winding will start out at 11 volts and slowly drop towards 8.5 volts.
2. Monitor the coolant sensor voltage using a volt meter. Do not use the scanner only.
3. Check that the power steering pressure switch is not on.
4. Check that the throttle position sensor signal voltage is .49 volts at closed throttle.
5. Use the scanner to check any other inputs to the computer.
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