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Home >> Chevrolet >> 2011 >> Suburban C2500 >> Repair and Diagnosis >> External Pages >> Different car >> Section 1756 (Engine Mechanical - Hybrid (LZ1) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Engine Noise Under Load

Engine Noise Under Load

WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
Engine Noise Under Load

Cause Correction
Review the system operation in order to familiarize yourself with the system functions. As required, disable the auto-stop function prior to repair. Refer to Hybrid Modes of Operation Description .
Low oil pressure
  1. Perform an oil pressure test. Refer to Oil Pressure Diagnosis and Testing .
  2. Repair or replace components, as required.
Detonation or spark knock Verify the correct operation of the ignition controls. Refer to Symptoms - Engine Controls .
Loose flex plate-to-dampener bolts
  1. Inspect the dampener 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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