GM Service Manual Online
For 1990-2009 cars only

Checks

Action

DEFINITION: After turning OFF the ignition, the engine continues to run roughly and unevenly. If the engine continues to run smoothly, check for a faulty ignition switch or ignition switch adjustment.

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 .