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 Switch: Description and Operation
The
vacuum switch converts carburetor ported vacuum into electrical signals and inputs to the ECU. The vacuum switch is one of the sensors used by the ECU to determine high vacuum (deceleration), and deactivates the two primary slow mixture cut-off valves to stop fuel flow during deceleration to improve fuel mileage.