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)

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Vacuum Control Flap Switchover Valve: Testing and Inspection

Connect a vacuum gauge to the ``EGR'' or ``T.C.C.'' solenoid port, while connecting a suitable vacuum pump to the ``Vacuum Regulator Valve'' port. Apply 15 inches Hg vacuum draw to ``VRV'' port, while noting reading of vacuum gauge. Vacuum gauge should read 2.5 inches lower than vacuum pump on all High Altitude V8 engines; and .75 inches lower on V6 and V8 (Exc. High Alt.) engines.