For 1990-2009 cars

Inspection/Test | Action
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DEFINITION: Engine continues to run after key is turned OFF, but runs very rough. If engine runs smooth, check the ignition switch and adjustment.
Preliminary |

• | Refer to Diagnostic System Check - Engine Controls .

• | 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 Solenoid Coil Test test procedures.

• | Inspect for fuel contamination. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .

• | Inspect for fuel in the pressure regulator vacuum hose.

• | Ensure 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.