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The evaporative emission purge valve is an important component of the exhaust and emission control system on a vehicle. It helps to stop fuel vapours escaping from the fuel tank into the atmosphere.
The evaporative emission purge valve connects to the engine, the car's ECU (Engine Control Unit) and the charcoal canister.
A vehicle's Evaporative Emission Control (EVAP) system stops the harmful vapours from escaping and holds them in the charcoal canister. The fuel vapours are then emitted from the charcoal canister and burned in the cylinders of the engine. This purging of the vapours is controlled by the evaporative emission purge valve, which manages how much vapour is released into the cylinders and when. The conditions have to be right before the valve opens to release vapour stored in the carbon canister. The evaporative emission purge valve works in conjunction with the car's ECU to ensure the conditions are right to open the valve and purge the gas. It's usually a solenoid that actions the opening and closing mechanism of the evaporative emission purge valve. The evaporative emission purge valve is shut when the engine is turned off. Once the engine is running properly and up to the correct temperature, the evaporative emission purge valve, instructed by the ECU (which uses information gathered from a variety of sensors) slowly opens to let some of the vapour held in the carbon canister out so it can be burned in the cylinders.
If there is a problem with the evaporative emission purge valve this will cause the Check Engine light to illuminate on the dashboard. The usual fault with this part occurs when the valve gets stuck open. A problem with the evaporative emission purge valve can sometimes cause the engine to have difficulty starting after filling up with fuel, causing the engine to splutter. When you need to replace this part, buying the evaporative emission purge valve will ensure you get a part that's compatible with the make and model of your vehicle.