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: Testing and Inspection

1. Disconnect vacuum line from air bypass valve to PVS valve at air bypass valve and connect to vacuum gauge.
2. With transmission in Park or Neutral and parking brake applied, start engine and allow to idle.
3. With engine at normal operating temperature, there should be a vacuum reading. If not, PVS is defective and should be replaced.