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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Mechanical - 2.4L) >> Diagnostic Information and Procedures >> Engine Noise Under Load

Engine Noise Under Load

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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. Refer to Symptoms - Engine Controls (LUK) .
Loose torque converter bolts
  1. Inspect the torque converter bolts and flywheel.
  2. Repair as required.
Cracked flywheel, automatic transmission
  1. Inspect the flywheel bolts and flywheel.
  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
Malfunctioning camshaft position actuators - improper oil viscosity or contamination.
  1. Verify correct oil pressure. If low, inspect the bottom of the oil filter for oil filter drain back feature. Refer to Oil Pressure Diagnosis and Testing .
  2. Isolate the noise to a specific camshaft position actuator. Disconnect the electrical connector on the camshaft position actuator solenoid valves and start the vehicle. If noise is gone, repeat procedure to limit to an individual actuator. Refer to Camshaft Position Intake Actuator Replacement , or Camshaft Position Exhaust Actuator Replacement .
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