Dieseling/Run-on

SYMPTOM DESCRIPTION:
Engine continues to run after key is turned "OFF", but runs very roughly. If engine runs smoothly, check ignition switch.



SYSTEM OR COMPONENT TO CHECK

FUEL SYSTEM

CHECK

- INJECTOR LEAKAGE: Check fuel system residual pressure, perform injector ballance test. Look for leaky injector(s).
- FUEL PUMP RELAY: Fuel pump should turn "OFF" when ignition is turned "OFF".



ENGINE

CHECK IDLE SPEED: Idle speed is computer controlled, if idle sped is incorrect, refer to COMPUTRES AND CONTROL SYSTEMS and see IDLE STABILIZER VALVE under COMPONENT AND CIRCUIT TESTING.