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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 949 (Engine Mechanical - 4.8L, 5.3L, 6.0L And 6.2L (1 Of 5)) >> Diagnostic Information and Procedures >> Base Engine Misfire with Excessive Oil Consumption

Base Engine Misfire with Excessive Oil Consumption

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Base Engine Misfire with Excessive Oil Consumption

Cause Correction
Worn valves, valve guides and/or valve stem oil seals
  1. Inspect the spark plugs for oil deposits. Refer to Spark Plug Inspection .
  2. Repair or replace, as required.
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.
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