How does a purge solenoid work?

A purge solenoid is an electromechanical valve that controls the flow of fuel vapor from the charcoal canister to the engine's intake manifold. When the engine is running and certain conditions are met, the engine control unit (ECU) activates the purge solenoid, allowing the stored fuel vapors to be drawn into the combustion chamber for burning. This process helps to reduce emissions and improve fuel efficiency. The solenoid typically consists of a coil, a plunger, and a spring, which work together to open and close the valve as per the ECU's signals.