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

PCV 1 - PCV Valve Shake Test

^ Remove the PCV valve from the engine valve cover and disconnect the valve from the PCV hose.

^ Vigorously shake the PCV valve and confirm that the valve plunger is free to move and rattle within the valve body.

^ Is the plunger free to move?

YES -- Go to PCV2. PCV 2 - PCV System Function

NO -- Replace the PCV valve.