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Engine Noise Under Load

WARNING: This page is about a different car, the 2018 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
Cause Correction
Low oil pressure
  1. Perform an oil pressure test. Refer to Oil Pressure Diagnosis and Testing .
  2. Repair or replace, as required.
Detonation or spark knock Verify the correct operation of the ignition controls. Refer to Symptoms - Engine Controls .
Loose torque converter bolts
  1. Inspect the torque converter bolts and flex plate.
  2. Repair, as required.
Cracked flex plate - automatic transmission
  1. Inspect the flex plate bolts and flex plate.
  2. 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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