Base Engine Misfire Diagnosis

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

Engine performance diagnostic procedures are covered in SELF-DIAGNOSTICS - 2.2L and /or SELF-DIAGNOSTICS - 3.0L and should be consulted for diagnosis of any driveability, emission, or Service Engine Soon lamp complaints.

IMPORTANT: The following diagnosis information covers common problems and possible causes. When the proper diagnosis is made, the problem should be corrected by adjustment, repair or part replacement as required. Refer to the appropriate section of this article for these procedures.

This diagnostic table will assist in engine misfire diagnosis due to a mechanical problem such as a faulty camshaft or leaking head gasket. Base engine timing is assumed to be correct and, that acceptable fuel is being used. This table will not identify a crossed injector wire, faulty injector, coil, driver, etc., or any other component failure or perceived misfire with no driveability symptoms (e.g. chipped reluctor ring with a DTC set or Service Engine Soon Light illuminated). The On-Board Diagnostic System Check must be performed first in order to ensure the correct table is followed for diagnosis of a misfire. Refer to SELF-DIAGNOSTICS - 2.2L and /or SELF-DIAGNOSTICS - 3.0L first, then, if necessary, refer to the following tables.

Fig 1: Base Engine Misfire Diagnosis Table (1 Of 3)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Base Engine Misfire Diagnosis Table (2 Of 3)

Courtesy of GENERAL MOTORS CORP.

Fig 3: Base Engine Misfire Diagnosis Table (2 Of 3)

Courtesy of GENERAL MOTORS CORP.