Cause | Correction | ||||||||
|---|---|---|---|---|---|---|---|---|---|
Abnormalities (severe cracking, bumps or missing areas) in the accessory drive belt (Abnormalities in the accessory drive system and/or components may cause engine RPM variations, noises similar to a faulty lower engine and also lead to a misfire condition. A misfire code may be present without an actual misfire condition.) | Replace the drive belt. Refer to Drive Belt Tensioner Replacement. | ||||||||
Worn, damaged, or mis-aligned accessory drive components or excessive pulley runout (A misfire code may be present without an actual misfire condition.) | Inspect the components, repair or replace as required. | ||||||||
Loose or improperly installed engine flywheel or crankshaft balancer (A misfire code may be present without an actual misfire condition.) | Repair or replace the flywheel and/or balancer as required. Refer to Engine Flywheel Replacement or Crankshaft Balancer Replacement. | ||||||||
Worn Piston Rings (Oil consumption may or may not cause the engine to misfire.) |
| ||||||||
Worn Crankshaft Thrust Bearings (Severely worn thrust surfaces on the crankshaft and/or thrust bearing may permit fore and aft movement of the crankshaft and create a DTC without an actual misfire condition.) | Replace the crankshaft and bearings as required. |
