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Base Engine Misfire with Excessive Oil Consumption

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. 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. Refer to Spark Plug Inspection in Engine Controls.
  • 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 in Engine Controls.
  • 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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