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 roughly. If the engine runs smoothly, check the ignition switch and adjustment.

Preliminary Check

    • Refer to Diagnostic System Check - Vehicle .
    • Refer to Symptoms - Engine Controls .

Fuel System Checks

    • Check the evaporative emission (EVAP) control system for proper operation or a saturated EVAP canister.
    • Check the fuel injectors for leaking. Refer to Fuel Injector Balance Test with Tech 2 .