Plugged oil filter

Replace the oil filter.

Low oil pressure

1. Verify proper oil level.
2. Perform an oil pressure test. Refer to Oil Pressure Diagnosis and Testing .
3. Repair or replace, as required.

Loose and/or worn valve rocker arm attachments

1. Inspect the valve rocker arm stud, nut, or bolt.
2. Repair or replace, as required.

Worn valve rocker arm

Replace the valve rocker arm.

Worn pushrod guide plate

Replace, as required.

Bent or damaged push rod

Inspect the following components and replace, as required:

Improper lubrication to the valve rocker arms

Inspect the following components and repair or replace, as required:

Broken valve spring

Replace the valve spring.

Worn and/or damaged valve rotators

Replace the valve rotators, as required.

Worn or dirty valve lifters

Replace the valve lifters.

Stretched or broken timing chain and/or damaged sprocket teeth

Replace the timing chain and sprockets.

Worn camshaft lobes

1. Inspect the camshaft lobes.
2. Replace the camshaft and valve lifters, as required.

Worn valve guides or valve stems

1. Inspect the valves and valve guides.
2. Repair, as required

Stuck valves

Carbon on the valve stem or valve seat may cause the valve to stick.

1. Inspect the valves and valve guides.
2. Repair, as required
3. Use GM top engine cleaner GM P/N 1050002, (Canadian P/N 992872) to eliminate carbon deposits following manufacturers instructions