GM Service Manual Online
For 1990-2009 cars only

Checks

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DEFINITION: The engine continues to run when the ignition is turned OFF, but usually runs very roughly.

Preliminary Checks

Refer to Important Preliminary Checks in Symptoms - Engine Controls .

Fuel System Checks

    â€¢ Test for proper EVAP Purge system operation -- KL6 only.
    â€¢ Test the fuel injectors for leakage.
    â€¢ Inspect for correct throttle blade adjustment, if applicable.
    â€¢ Perform the fuel system diagnostic procedure. Refer to Fuel System Diagnosis .

Additional Checks

If the engine continues to run smoothly when the ignition is turned OFF inspect for the following:

    â€¢ Proper ignition switch adjustment
    â€¢ A short to voltage in the PCM ignition feed circuit.