Engine Noise Under Load. Generic Unit Repair 2002

For 1990-2009 cars only

Makes 🢒 Generic 🢒 2002 🢒 Unit Repair 🢒 Engine 🢒 Engine Mechanical - 3.0L (LW9) 🢒 Engine Noise Under Load

Cause

Correction

Important: A cold piston knock which disappears in 1.5 minutes should be considered acceptable. A cold engine knock usually disappears when the specific cylinder's secondary ignition circuit is grounded out during diagnosis.

A low rumble/knocking may indicate a crankshaft or piston (lower engine) concern.

Low oil pressure

•	Perform an oil pressure test. Refer to Oil Pressure Diagnosis and Testing .

•	Repair or replace as required.

Detonation or spark knock

Verify the correct operation of the ignition controls. Refer to Engine Controls - 2.5L (LB9) and 3.0L (LW9).

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