For 1990-2009 cars

Condition | Action
--- | ---
Loose, worn or damaged valve bridge and finger-follower |

1. Inspect valve bridge and finger-follower.
2. Repair or replace all damaged components.

Broken valve springs |

1. Inspect valve springs.
2. Repair or replace all damaged components.

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

1. Inspect valves and valve guides.
2. Repair or replace all damaged components.

Worn or faulty camshaft lobes |

1. Inspect camshaft lobes.
2. Repair or replace all damaged components.