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

Air Injection Check Valve: Service and Repair

1. Remove check valve(s) from vehicle.
2. Blow through check valve in direction of AIR manifold or cylinder head, then attempt to suck back in reverse direction.
- Air should only flow towards air manifold or cylinder head. If this is not the case, replace check valve.