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Home >> Cadillac >> 2010 >> STS 3.6 V, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Mechanical - 4.6L (LH2) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Base Engine Misfire with Excessive Oil Consumption

Base Engine Misfire with Excessive Oil Consumption

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Cause Correction
Worn valves, valve guides and/or valve stem oil seals
  • Inspect the spark plugs for oil deposits. Refer to Spark Plug Inspection .
  • Repair or replace as required.
Worn Piston Rings
Oil consumption may or may not cause the engine to misfire.
  • Inspect the spark plugs for oil deposits. Refer to Spark Plug Inspection .
  • Inspect the cylinders for a loss of compression. Refer to Engine Compression Test .
  • Perform cylinder leak down and compression testing to determine the cause.
  • Repair or replace as required.
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