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 .

Fuel System Checks

    • Check the EVAP control system. Refer to Evaporative Emission Control System Diagnosis .
    • Check for leaking fuel injectors. Refer to Sequential Multiport Fuel Injector Balance Test .