Engine Noise Under Load. Chevrolet Avalanche

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2004 🢒 Avalanche - 4WD 🢒 Engine 🢒 Engine Controls - 8.1L 🢒 Engine Noise Under Load

Cause

Correction

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 Detonation/Spark Knock in Engine Controls - 8.1L.

Loose torque converter bolts or improperly installed torque converter

•	Inspect the torque converter bolts and flywheel.

•	Verify correct installation of the torque converter.

•	Repair as required.

Cracked flywheel

•	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