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Home >> Chevrolet >> 2004 >> Avalanche 2500 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Engine Mechanical (Introduction) 4.8L, 5.3L & 6.0L) >> 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. Refer to Detonation/Spark Knock in Engine Controls - 4.8L, 5.3L, and 6.0L.
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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