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LEMON is the spiritual successor to CHARM, I recommend you try it!
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Vacuum Advance Control Solenoid: Description and Operation
This valve is used on some automatic transmission equipped vehicles with air conditioning. The function of the DVSV is to prevent detonation when the A/C is on and coolant temperature is above 120° F, by supplying ported vacuum rather than manifold vacuum to the
distributor vacuum advance unit. The solenoid is energized whenever the air conditioning is in use.