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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 421 (Engine Mechanical - 4.8L, 5.3L, & 6.0L (On-Vehicle)) >> Diagnostic Information and Procedures >> Engine Noise Under Load

Engine Noise Under Load

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Engine Noise Under Load

Cause Correction
Low oil pressure
Detonation or spark knock Verify the correct operation of the ignition 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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