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.

Low oil pressure

Loose and/or worn valve rocker arm attachments

Worn valve rocker arm

Replace the valve rocker arm.

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 timing chain tensioner (if applicable)

Replace the timing chain tensioners as required.

Worn engine camshaft lobes

Damaged, broken, or dirty, balance shaft sprocket teeth (if applicable)

Inspect the following components, and repair as required:

Worn valve guides or valve stems

Inspect the following components, and repair as required:

Stuck Valves

(Carbon on the valve stem or valve seat may cause the valve to stay open)

Inspect the following components, and repair as required: