Inspection Procedure 12 - Engine Stalls At Idle When Engine Is Warm

NOTE: Possible causes are: defective ignition system, defective air/fuel ratio control system, defective idle air control motor system or vacuum leaks.

Check if battery was previously disconnected. If battery was not disconnected, go to next step. If battery was disconnected, reconnect battery. Start and warm engine to normal operating temperature. Allow engine to idle for at least 10 minutes, and then recheck engine idle.
Using scan tool, check for stored Diagnostic Trouble Codes (DTCs). If stored DTCs exist, perform appropriate test procedures for each DTC, and clear DTCs from ECM. If no DTCs exist, go to next step.
Ensure engine coolant temperature is less than 68°F (20°C). Turn ignition on. Listen for operating sound at idle air control motor when ignition is turned off. Idle air control motor is mounted on throttle body and contains a 6-pin Black connector.
If idle air control motor operating sound is heard, go to next step. If idle air control motor operating sound is not heard, check idle control system. Perform DTC TEST NO. 24.
Using stethoscope, check for operating sound at injector with engine idling. If injector operating sound is heard, go to next step. If injector operating sound is not heard, check injector circuit. Perform DTC TEST NO. 12
If engine does not stall right after accelerator pedal is released, go to next step. If engine stalls right after accelerator pedal is released, clean throttle body and check adjustment of fixed Speed Adjusting Screw (SAS). See the ADJUSTMENTS - 2.0L & 2.4L article.
If engine stalls easily again, go to next step. If engine does not stall easily again, problem is intermittent. Check for sudden changes in the following signals or voltages: crankshaft position sensor signal, volume airflow sensor signal, injector driver signal, primary and secondary ignition signal, fuel pump drive signal and ECM power supply voltage. Repair intermittent problem.
Perform INSPECTION PROCEDURE 37. Once inspection procedure No. 37 is performed and all components are okay, go to next step.
Check ignition timing. See procedures in the ADJUSTMENTS - 2.0L & 2.4L article. If ignition timing is within specification, go to next step. If ignition timing is not correct, check for correct installation of crankshaft position sensor and timing belt cover.
Check for defective ignition coil, spark plugs and spark plug wires. Check for clogged injectors, low compression and contaminated fuel. Repair or replace components as necessary.