The Canister Purge Valve in the Lincoln MKX directs fuel vapor from the canister to the engine so hydrocarbons burn rather than escape into the air where they create smog. The earlier Lincoln types were equipped with a basic vacuum-controlled device with a pressure relief fuel cap. Later MKX models brought in an electronically commanded solenoid linked to OBD II logic. This allowed the computer to close the vent line, open the Canister Purge Valve, and monitor the tank pressure sensor to check for sealing. Over the years of the Lincoln MKX, the Canister Purge Valve has remained compact but matured in its control strategy. The primary development here is a change from mechanical control to computer supervision, providing better leak detection and quicker warning of a loose cap or sticking Canister Purge Valve that would cause excess emissions. When opened, the intake vacuum causes the air to flow through the activated charcoal which holds the vapor. This combines with the air-fuel charge so the combustion burns it off. A stuck Canister Purge Valve hinders vapor flow, causing vapors to stay trapped or leak, which can drop mileage and trigger the check engine light. In any Lincoln model, a prompt replacement restores running, while a sealed MKX has smoother idle, driver reports.
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