Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Positive Crankcase Ventilation: Testing and Inspection

A plugged valve or hose may cause:

^ Rough Idle.

^ Stalling or slow idle speed.

^ Oil leaks.

^ Oil in the air cleaner.

^ Sludge in the engine.

A leaking or stuck open valve, leaking hose, or missing grommet may cause:

^ Rough idle.

^ Stalling.

^ High idle speed.