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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1443 (Engine Mechanical - 4.2L (Ll8)) >> Diagnostic Information and Procedures >> Engine Noise Under Load

Engine Noise Under Load

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Engine Noise Under Load

Cause Correction
Low oil pressure
Detonation or spark knock Verify the correct operation of the ignition system. Refer to Detonation/Spark Knock in Engine Controls.
Loose torque converter bolts
  • Inspect the torque converter bolts and flywheel.
  • Repair as required.
Cracked flywheel (automatic transmission)
  • Inspect the flywheel bolts and flywheel.
  • Repair as required.
Excessive connecting rod bearing clearance Inspect the following components, and repair as required:
  • The connecting rod bearings
  • The connecting rods
  • The crankshaft
Excessive crankshaft bearing clearance Inspect the following components, and repair as required:
  • The crankshaft bearings
  • The crankshaft journals
  • The cylinder block crankshaft bearing bore
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