| Abnormalities (server cracking, bumps or missing areas) in the accessory drive belt |
Abnormalities in the accessory drive belt and/or components may cause engine RPM variations, noises similar to faulty lower engine and also lead to a misfire condition. A misfire code may be present without an actual misfire condition.
- Inspect the accessory drive components.
- Repair or replace all damaged components.
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| Worn, damaged or misaligned accessory drive components or excessive pulley runout |
A misfire code may be present without an actual misfire condition.
- Inspect the accessory drive components.
- Repair or replace all damage components.
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| Loose and/or damaged crankshaft pulley |
A misfire code may be present without an actual misfire condition.
- Repair or replace all damaged components.
- Inspect crankshaft pulley and pulley bolt.
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| Loose torque converter bolts |
A misfire code may be present without an actual misfire condition.
- Inspect torque converter bolts and flywheel.
- Repair or replace all damaged components.
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| Loose and/or damaged flywheel |
A misfire code may be present without an actual misfire condition.
- Inspect flywheel and flywheel attaching bolts.
- Repair or replace all damaged components.
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| Excessive piston-to-cylinder bore clearance |
- Perform cylinder leak down and compression tests.
- Inspect the piston, piston rings and cylinder bore.
- Repair or replace all damaged components.
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| Excessive crankshaft thrust bearing clearance |
Severely worn thrust surfaces on the crankshaft and/or thrust bearing may permit for and aft movement of the crankshaft and create a misfire code without an actual misfire condition.
- Inspect the crankshaft end play and crankshaft thrust bearings.
- Repair or replace all damaged.
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