GM Service Manual Online
For 1990-2009 cars only

Checks

Action

DEFINITION: The engine continues to run, very roughly and unevenly, after turning Off the ignition. Check for a faulty ignition switch or ignition switch adjustment if the engine continues to run smoothly.

Preliminary Check

    • Refer to Symptoms - Engine Controls .

Fuel System Checks

    • Check the evaporative emission (EVAP) control system. Refer to Evaporative Emission Control System Diagnosis .
    • Check for leaking fuel injectors. Refer to Fuel Injector Balance Test with Special Tool .