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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temporarily or
permanently
Frequency Valve: Description and Operation
The
frequency valve is located behind the air filter. It is connected to the
fuel distributor and the
fuel tank return line. The frequency valve responds to varying signals from the ECU and operates to control the amount of fuel injected into each cylinder.