GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 Caprice WM 🢒 Engine 🢒 Engine Cooling 🢒 Lower Engine Noise, Regardless of Engine Speed

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. Inspect the valves, valve guides and/or valve stem oil seals. Refer to Valve Stem Oil Seal and Valve Spring Replacement.
  3. 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.
    • Inspect the cylinders for a loss of compression. Refer to Engine Compression Test.
    • Perform a cylinder leak down test. Refer to Cylinder Leakage Test.
    • Repair or replace, as required.