Initial misfire without internal engine noise
STATE
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operation, action
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anomalies (severe cracking, unevenness, or missing patches) accessory drive belt.
As well as wear, damage, or misalignment of accessory drive components, or excessive pulley runout.
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Abnormalities in the belt and/or accessory drive components can cause fluctuations in engine speed, noise like a malfunction in the lower part of the engine, and misfire. A misfire code may appear without the actual conditions causing the misfire.
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Loose and/or damaged crankshaft pulley
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A misfire code may appear without the actual conditions causing the misfire.
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Loose torque converter bolts
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A misfire code may appear without the actual conditions causing the misfire.
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Loose and/or damaged flywheel
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A misfire code may appear without the actual conditions causing the misfire.
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Obstruction in the exhaust system
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A severe obstruction in the exhaust flow can cause significant engine performance degradation and can set a misfire code. Possible causes of obstructions include bent or deformed pipes, clogged mufflers and/or catalytic converters.
Repair or replace any damaged components.
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Air in the fuel system
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Kinked and/or worn valve bridge and tappet pin.
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Valve sticking
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Carbon deposits on the valve stem or valve seat can cause the valve to stick.
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Damaged or misaligned timing gears.
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Worn or defective camshaft lobes
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Excessive clearance between piston and cylinder bore
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Malfunction and / or cracking of cylinder head gaskets or other damage to the channels of the cooling system of the cylinder heads and engine block. (Coolant consumption may or may not cause the engine to overheat.)
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Initial misfire with abnormal interior noises at the bottom of the engine
STATE
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operation, action
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anomalies (severe cracking, unevenness, or missing patches) accessory drive belt.
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Abnormalities in the belt and/or accessory drive components can cause fluctuations in engine speed, noise like a malfunction in the lower part of the engine, and misfire. A misfire code may appear without the actual conditions causing the misfire.
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Worn, damaged, or misaligned accessory drive components or excessive pulley runout.
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A misfire code may appear without the actual conditions causing the misfire.
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Loose and/or damaged crankshaft pulley
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A misfire code may appear without the actual conditions causing the misfire.
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Loose torque converter bolts
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A misfire code may appear without the actual conditions causing the misfire.
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Loose and/or damaged flywheel
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A misfire code may appear without the actual conditions causing the misfire.
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Excessive clearance between piston and cylinder bore
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Excessive crankshaft thrust bearing clearance
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Severe wear on the thrust surfaces of the crankshaft and/or thrust bearing can allow movement in the front and rear of the crankshaft and create a misfire code without actual misfire conditions.
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Initial misfire with abnormal valve train noises
STATE
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operation, action
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Loose fastening, wear or damage to the valve bridge and pusher pin
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Broken valve springs
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Valve sticking
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Carbon deposits on the valve stem or valve seat can cause the valve to stick.
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Worn or defective camshaft lobes
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Initial misfire with coolant flow
Inspection
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operation, action
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Definition: Initial misfire with coolant flow
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Preview
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Check for external coolant leaks. See Section 1D1, Engine Cooling - 2.0 Diesel.
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Locate damaged cylinders
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Visual inspection of the exhaust gas recirculation system (EGR)
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Leak in cylinder head gasket
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Damage to the cylinder head or engine block
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Initial misfire with excessive oil consumption
STATE
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operation, action
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Valve guide wear
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Wear of valve stem seals
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Excessive clearance between piston and cylinder bore
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