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Upper Engine Noise, Regardless of Engine Speed

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
Upper Engine Noise, Regardless of Engine Speed

Cause Correction
Low oil pressure
  1. Perform an oil pressure test. Refer to Oil Pressure Diagnosis and Testing .
  2. Repair or replace as required.
Loose and/or worn valve rocker arm attachments
  1. Inspect the valve rocker arm stud, nut or bolt.
  2. Repair or replace as required.
Worn valve rocker arm Replace the valve rocker arm.
Improper lubrication to the valve rocker arms Inspect the following components, and repair or replace as required:
  • The valve rocker arm
  • The valve lash adjuster
  • The oil filter bypass valve
  • The oil pump and pump screen
  • The engine block oil galleries
Broken valve spring Replace the valve spring.
Worn or dirty valve lash adjusters Replace the valve lash adjusters.
Stretched or broken timing chain and/or damaged sprocket teeth Replace the timing chain and sprockets.
Worn, damaged, or faulty timing chain tensioners Replace tensioners
Worn engine camshaft lobes
  1. Inspect the engine camshaft lobes.
  2. Replace the camshaft and valve lash adjusters as required.
Worn valve guides or valve stems Inspect the following components, and repair as required:
  • The valves
  • The valve guides
Stuck valves
Carbon on the valve stem or valve seat may cause the valve to stay open.		 Inspect the following components, and repair as required:
  • The valves
  • The valve guides
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