GM Service Manual Online
For 1990-2009 cars only

Dieseling, Run-On

Checks

Action

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

Preliminary Check

    • Refer to Symptoms .

Fuel System Checks

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