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Engine Noise Under Load

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. 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 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
Loose or damaged RPO HP2 flexplate Repair or replace flexplate.
Loose or damaged RPO HP2 stator or rotor
  • Inspect the stator and rotor.
  • Repair or replace as required.
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