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Engine Noise Under Load (LDK, LHU)

Engine Noise Under Load (LDK, LHU)


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 control .

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 .




PRE-RELEASE