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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1628 (Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Base Engine Misfire with Abnormal Internal Lower Engine Noises

Base Engine Misfire with Abnormal Internal Lower Engine Noises

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Cause Correction
Abnormalities, such as 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.
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 and repair or replace, as required.
Loose or improperly installed engine flex plate or crankshaft balancer
A misfire code may be present without an actual misfire condition.		 Repair or replace the flex plate and/or balancer, as required. Refer to Automatic Transmission Flex Plate Removal and Automatic Transmission Flex Plate Installation , orCrankshaft Balancer Removal and Crankshaft Balancer Installation .
Worn piston rings
Oil consumption may or may not cause the engine to misfire.
  1. Inspect the spark plugs for oil deposits. Refer to Spark Plug Inspection .
  2. Inspect the cylinders for a loss of compression. Refer to Engine Compression Test .
  3. Perform cylinder leak down and compression testing to determine the cause. Refer to Cylinder Leakage Test .
  4. Repair or replace, as required.
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.
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