Initial misfire without internal engine noise
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STATE
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Operation, action
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Anomalies (severe cracking, unevenness or missing areas) auxiliary drive belt.
As well as wear, damage or distortion of the drive components of the units or excessive runout of the pulley.
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Anomalies in the belt and / or drive components of auxiliary units can cause engine speed fluctuations, noise, as in the case of a malfunction in the lower part of the engine, and also lead to misfiring. The misfire code may appear even if there are no actual conditions causing the misfire.
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Loose and/or damaged crankshaft pulley
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A misfire code may occur without actual misfire causing conditions present.
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Loose torque converter bolts
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A misfire code may occur without actual misfire causing conditions present.
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Loose fastening and/or damage to the flywheel
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A misfire code may occur without actual misfire causing conditions present.
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Obstruction in the exhaust system
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A severe obstruction in the exhaust flow can cause significant loss of engine performance and may set a misfire code. Possible causes of obstruction include bent or distorted pipes, clogged mufflers and/or catalytic converters.
Repair or replace all damaged components.
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Air in the fuel system
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Bending and/or wear of the valve bridge and pusher 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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Damage or misalignment of 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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Failure and/or cracking of cylinder head gaskets or other damage to the cooling system channels of the cylinder heads and engine block. (Coolant consumption may or may not cause engine overheating.)
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Initial misfire with abnormal internal noises occurring in the lower part of the engine
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STATE
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Operation, action
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Anomalies (severe cracking, unevenness or missing areas) auxiliary drive belt.
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Anomalies in the belt and / or drive components of auxiliary units can cause engine speed fluctuations, noise, as in the case of a malfunction in the lower part of the engine, and also lead to misfiring. The misfire code may appear even if there are no actual conditions causing the misfire.
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Worn, damaged or misaligned drive components or excessive pulley runout.
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A misfire code may occur without actual misfire causing conditions present.
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Loose and/or damaged crankshaft pulley
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A misfire code may occur without actual misfire causing conditions present.
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Loose torque converter bolts
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A misfire code may occur without actual misfire causing conditions present.
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Loose fastening and/or damage to the flywheel
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A misfire code may occur without actual misfire causing conditions present.
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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 crankshaft thrust surfaces and/or thrust bearing can allow movement in the front and rear of the crankshaft and create a misfire code without actual misfire causing conditions occurring.
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Initial misfire with abnormal valve train noises
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STATE
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Operation, action
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Loose, worn or damaged valve bridge and tappet
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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 consumption
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Inspection
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Operation, action
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Definition: Initial misfire with coolant consumption
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Preliminary inspection
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Check for external coolant leaks. See. Section 1D1, Engine Cooling - 2.0 Diesel.
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Localize damaged cylinders
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Visual inspection of the exhaust gas recirculation (EGR) system
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Cylinder head gasket leak
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Damage to the cylinder head or engine block
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Initial misfire with excessive oil consumption
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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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(The text of the article was obtained from the website: ChevyMan)