GM Service Manual Online
For 1990-2009 cars only

Cause

Correction

Low oil pressure

    â€¢ Perform an oil pressure test. Refer to Oil Pressure Diagnosis and Testing .
    â€¢ Repair or replace as required.

Detonation or spark knock

Verify the correct operation of the ignition controls. Refer to Engine Controls.

Loose torque converter bolts

    â€¢ Inspect the torque converter bolts and flywheel. Refer to Engine Flywheel Removal .
    â€¢ Repair as required.

Cracked flywheel (automatic transmission)

    â€¢ Inspect the flywheel bolts and flywheel. Refer to Engine Flywheel Removal .
    â€¢ Repair as required.

Excessive connecting rod bearing clearance

Inspect the following components, and repair as required:

    â€¢ The connecting rod bearings; refer to Piston, Connecting Rod, and Bearing Cleaning and Inspection .
    â€¢ The connecting rods; refer to Piston, Connecting Rod, and Bearing Cleaning and Inspection .
    â€¢ The crankshaft; refer to Crankshaft and Bearing Cleaning and Inspection .

Excessive crankshaft bearing clearance

Inspect the following components, and repair as required:

    â€¢ The crankshaft bearings; refer to Crankshaft and Bearing Cleaning and Inspection .
    â€¢ The crankshaft journals; refer to Crankshaft and Bearing Cleaning and Inspection .
    â€¢ The cylinder block crankshaft bearing bore