GM Service Manual Online
For 1990-2009 cars only

Cause

Correction

Worn or damaged valve

    • Inspect the valves.
    • Inspect the valve guides.
    • Repair or replace damaged components as required.

Worn, damaged or improperly installed piston rings (piston rings must be installed with the mark, or dimple, on the top of the piston ring, facing up)

    • Inspect the spark plugs.
    • Verify engine compression.
    • Inspect the cylinder bores.
    • Inspect the pistons.
    • Inspect the piston pins.
    • Inspect the connecting rods.
    • Repair or replace damaged components as required.