For 1990-2009 cars

Cause | Correction
--- | ---
Low oil pressure |

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

• | 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 | Set or replace the timing chain and sprockets.
Worn or improperly set timing chain tensioner, if applicable | Replace the timing chain tensioners as required.
Worn engine camshaft lobes |

• | Inspect the engine camshaft lobes.

• | Replace the camshaft and valve lifters as required.

Worn valve guides or valve stems | Inspect the following components, and repair as required:

• | The valves

• | The valve guides

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:

• | The valves

• | The valve guides