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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 84 (Engine Mechanical - 3.7L) >> Diagnostic Information and Procedures >> Upper Engine Noise, Regardless of Engine Speed

Upper Engine Noise, Regardless of Engine Speed

WARNING: This page is about a different car, the 2007 Isuzu i-370, 2007 GMC Canyon, and 2007 Chevrolet Colorado. 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
Worn or damaged valve rocker arm
  • Inspect the rocker arm for wear or missing needle bearings
  • Replace the valve rocker arms as required.
Improper lubrication to the valve rocker arms Inspect the following components, and repair or replace as required:
  • The valve rocker arm
  • The valve lash adjusters
  • The oil filter bypass valve
  • The oil transfer tube
  • 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 engine camshaft lobes
  • Inspect the engine camshaft lobes.
  • Replace the camshaft, valve lash adjusters, and rocker arms 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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