GM Service Manual Online
For 1990-2009 cars only

Dieseling, Run-On

Checks

Action

DEFINITION: Engine continues to run when turning the key OFF, but runs very roughly. If the engine runs smoothly, check the ignition switch and adjustment.

Preliminary Check

Refer to Symptoms for the Important Preliminary Checks.

Fuel System Checks

    • Check the Evaporative Emission (EVAP) system and fuel tank venting.
    • Check the fuel injectors for leakage. Refer to Fuel Metering System Diagnosis