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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1628 (Engine Mechanical - 6.6L (LMM) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Base Engine Misfire with Abnormal Valve Train Noise

Base Engine Misfire with Abnormal Valve Train Noise

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Condition Action
Loose, worn or damaged rocker arm
  1. Inspect valve rocker arm and rocker arm shaft.
  2. Repair or replace all damaged components.
Loose valve rocker arm attachments
  1. Inspect valve rocker arm and rocker arm shaft.
  2. Repair or replace all damaged components.
Worn or damaged pushrods
  1. Inspect the pushrods for excessive wear.
  2. Inspect the pushrods for bent condition.
  3. Inspect the pushrods for broken tip.
  4. Replace pushrod if any damage is found.
Broken valve springs
  1. Inspect valve springs.
  2. Repair or replace all damaged components.
Worn and/or damaged valve rotator
  1. Inspect valve rotators.
  2. Repair or replace all damaged components.
Sticking valve Carbon on the valve stem or valve seat may cause the valve to stick.
  1. Inspect valves and valve guides.
  2. Repair or replace all damaged components.
Worn or faulty camshaft lobes
  1. Inspect camshaft lobes.
  2. If damaged replace camshaft and all lifters.
Excessive valve lash
  1. Check the valve lash adjustment, and correct if above specifications.
  2. Repair or replace all damaged components.
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