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Base Engine Misfire with Excessive Oil Consumption

WARNING: This page is about a different car, the 2003 Chevrolet Monte Carlo and 2003 Chevrolet Impala. 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
  • Inspect the spark plugs for oil deposits.
  • 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.
  • 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.
Worn or faulty lower intake manifold gaskets Replace as required.
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