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Base Engine Misfire with Abnormal Valve Train Noise

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Base Engine Misfire with Abnormal Valve Train Noise

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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