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Base Engine Misfire with Excessive Oil Consumption

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Base Engine Misfire with Excessive Oil Consumption

Condition Action
Worn valve guides
  1. Inspect the valves and valve guides.
  2. Repair or replace all damaged components.
Worn valve stem oil seals
  1. Inspect the valve stem oil seals.
  2. Repair or replace all damaged components.
Excessive piston-to-cylinder bore clearance
  1. Perform cylinder leak down and compression tests to determine the cause.
  2. Inspect the piston rings for low ring tension, broken or worn rings.
  3. Inspect cylinder bore.
  4. Repair or replace all damaged components.
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