GM Service Manual Online
For 1990-2009 cars only

Dieseling, Run-On Symptom

Step

Action

Value(s)

Yes

No

DEFINITION: Engine continues to run after key is turned OFF, but runs very rough. If engine runs smooth, check ignition switch and adjustment.

1

Was the Powertrain On-Board Diagnostic (OBD) System Check performed?

--

Go to Step 2

Go to the Powertrain (OBD) System Check

2

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

Was a bulletin found that addresses the symptom?

--

Go to Step 6

Go to Step 3

3

Was visual/physical check performed?

--

Go to Step 4

Go to Visual /Physical check.

4

  1. Check for a short between B+ and any of the ignition feed circuits (refer to Fuse Block Details. )
  2. If a problem is found, repair as necessary.

Was a problem found?

--

Go to Step 6

Go to Step 5

5

  1. Review all diagnostic procedures within this table.
  2. If all procedures have been completed and no malfunctions have been found, review/inspect the following:
  3. •  Visual/physical inspection.
    •  Scan Tool data.
    •  Freeze Frame data/Failure Records Data.
    •  All electrical connections within a suspected circuit and/or system.
  4. If a problem is found, repair as necessary.

Was a problem found?

--

Go to Step 6

Go to the Powertrain (OBD) System Check

6

Operate the vehicle to duplicate conditions present when the original symptom was noted.

Is symptom still present?

--

Go to Step 3

Repair complete.