Mercury Cougar Canister Purge Valve is a device applied to control the flow of evaporative emissions from the charcoal canister in your vehicle's fuel system to the engine. This small electrically operated valve opens in response to manifold vacuum rise and powertrain computer command on certain years of Cougar, allowing air to draw vapors from activated charcoal and into the cylinders. The Canister Purge Valve prevents hydrocarbons from escaping, ensures smog compliance, and also prevents tank damage caused by pressure build-up. Mercury vehicles produced in the early seventies applied a simple vacuum-operated Canister Purge Valve. Moreover, later OBD II Mercury models switched to a solenoid style Canister Purge Valve monitored by a tank pressure sensor. With modern-day engineering, the computer seals the vent, opens the Canister Purge Valve, and sees if the system holds vacuum. If the computer finds a leak or loose cap, then the warning light will come on. Through every Cougar trim, the upgrade did not change outward fitment, though the electronically driven valve reacts more quickly and meets onboard diagnostics. Thus, modern-day Mercury Cougar emissions are cleaner and more dependable.
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