Dieseling/Run-on

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



SYSTEM OR COMPONENT TO CHECK

FUEL SYSTEM

CHECK

INJECTOR LEAKAGE: Check fuel system residual pressure, perform injector ballance test (see FUEL SYSTEMS). 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, see IDLE STABILIZER VALVE under COMPONENT AND CIRCUIT TESTING.