Dieseling, Run-On

Inspection/Test	Action
DEFINITION: Engine continues to run after key is turned OFF, but runs very rough. If engine runs smooth, inspect the ignition switch and adjustment.
Preliminary	Perform the Diagnostic System Check - Vehicle in Vehicle DTC Information Refer to Intermittent Conditions before starting. Search for bulletins.
Fuel System	Test the fuel system circuits for proper operation. Refer to Fuel Pump Electrical Circuit Diagnosis . Test for low fuel pressure. Refer to Fuel System Diagnosis . Test for faulty fuel injectors. Refer to Fuel Injector Balance Test with Special Tool , Fuel Injector Balance Test with Tech 2 , Fuel Injector Coil Test test procedures. Inspect for fuel contamination. Refer to Alcohol/Contaminants-in-Fuel Diagnosis (With Special Tool) . Inspect for fuel in the pressure regulator vacuum hose. Ensure that each injector harness is connected to the correct injector/cylinder.
Additional	Test for short between battery positive voltage and any of the ignition feed circuits. Refer to Wiring Repairs in Wiring Systems.