GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 HUMMER 🢒 2003 🢒 H2 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, and 6.0L 🢒 Base Engine Misfire with Excessive Oil Consumption

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. 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 cylinder leak down and compression testing to determine the cause. Refer to Cylinder Leakage Test .
    • Repair or replace, as required.