For 1990-2009 cars

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

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

Loose and/or worn Stationary Hydraulic Lash Adjuster (SHLA), valve rocker arm. |

1. Inspect the SHLA, valve rocker arm.
2. Repair or replace as required.

Incorrect lubrication to the SHLAs, valve rocker arms. | Inspect the following components, and repair or replace as required:

• | The SHLA, valve rocker arm

• | The high stationary SHLA, valve lifter

• | The oil filter

• | The oil pump and pump screen

• | The cylinder head oil galleries

• | The cylinder block oil galleries

Broken valve spring | Replace the valve spring.
Worn or dirty SHLAs, valve lifters | Replace the SHLAs, valve lifters.
Stretched or broken timing chain or chains and/or damaged sprocket teeth | Replace the timing chain or chains and sprockets.
Worn timing chain tensioner or tensioners | Replace the timing chain tensioner or tensioners as required.
Worn timing chain shoe or shoes | Replace the timing chain shoe or shoes as required.
Worn timing chain guide or guides | Replace the timing chain guide or guides as required.
Worn engine camshaft lobes |

1. Inspect the engine camshaft lobes.
2. Replace the camshaft or camshafts and SHLAs, 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