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Home >> Chevrolet >> 2011 >> Impala LS, 3.9 M >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Mechanical - 3.5L - 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
  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.
  4. Repair or replace as required.
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