Condition | Action |
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Abnormalities (severe cracking, bumps or missing areas) in the accessory drive belt. Also worn, damaged, or misaligned accessory drive components or excessive pulley runout. | Abnormalities in the accessory drive belt 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.
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Loose and/or damaged crankshaft balancer | A misfire code may be present without an actual misfire condition.
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Loose torque converter bolts | A misfire code may be present without an actual misfire condition.
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Loose and/or damaged flywheel | A misfire code may be present without an actual misfire condition.
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Restricted exhaust system | A severe restriction in the exhaust flow can cause significant loss of engine performance and may set a misfire code. Possible causes of restrictions include collapsed or dented pipes, plugged mufflers and/or catalytic converters. Repair or replace all damaged components. |
Air in fuel system |
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Bent and/or worn valve pushrod |
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Sticking valve | Carbon on the valve stem or valve seat may cause the valve to stick.
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Damaged or misaligned timing gears |
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Worn or faulty camshaft lobes |
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Excessive piston-to-cylinder bore clearance |
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Faulty cylinder head gaskets and/or cracking or other damage to the cylinder heads and engine block cooling system passages. (Coolant consumption may or may not cause the engine to overheat.) |
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Overfilled Crankcase |
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