GM Service Manual Online
For 1990-2009 cars only

Cause

Correction

Damaged or improperly installed cylinder head

(Coolant consumption may or may not cause the engine to misfire.)

    â€¢ Inspect the spark plugs. Refer to Spark Plug Inspection in Engine Controls.
    â€¢ Verify engine compression. Refer to Engine Compression Test.
    â€¢ Inspect the cylinder heads.
    â€¢ Inspect the engine block.
    â€¢ Repair or replace damaged components as required.