For 1990-2009 cars

#### Dieseling, Run-On Symptom

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
DEFINITION The engine continues to run after the key is turned off, but runs very rough. If the engine runs smooth, check the ignition switch and the adjustment.
1 | Did you perform the On-Board Diagnostic (OBD) System Check? | -- | Go to Step 2 | Go to the Powertrain On Board Diagnostic (OBD) System Check
2 |

1. Perform a bulletin search.
2. If a bulletin that addresses the symptom is present, correct the condition as instructed in the bulletin.

Did you find a bulletin that addresses the symptom?

--

Go to Step 6

Go to Step 3

3 | Did you perform a visual/physical check? | -- | Go to Step 4 | Go to Symptoms for the Visual /Physical Check
4 |

1. Check for a short between B+ and any of the ignition feed circuits. Refer to Fuse and Relay Block Diagnosis or Wiring Repairs in Wiring Systems.
2. If a problem is present, repair as necessary.

Did you find a problem?

--

Go to Step 7

Go to Step 5

5 |

1. Check for the following conditions:

• | Fuel in the fuel pressure regulator vacuum hose. If fuel is present in the hose, replace the fuel pressure regulator assembly. Refer to Fuel Pressure Regulator Replacement.

• | Leaking injectors. Refer to Fuel System Diagnosis .

2. If a problem is present, repair as necessary.

Did you find a problem?

--

Go to Step 7

Go to Step 6

6 |

1. Review all of the diagnostic procedures within this table.
2. If all of the procedures have been completed and no malfunctions have been found, review/inspect the following:

• | The scan tool data

• | The Freeze Frame data

• | All of the electrical connections within a suspected circuit and/or system.

3. If a problem is present, repair as necessary.

Did you find a problem?

--

Go to Step 7

Go to Step 3

7 | Operate the vehicle under the same conditions (as closely as possible) as when the original symptom occurred. Is the original symptom still present? | -- | Go to Step 3 | Go to Step 8
8 | Are other driveability symptoms still present? | -- | Go to Symptoms | System OK