The purge valve, also known as the canister purge valve is a component that is part of the EVAP system. It helps maintain the right amount of air-fuel ratio in the engine.
Canister purge valve functionThe purge valve is a crucial component of the Evaporative emission control system(EVAP). The EVAP system seals off the fuel system in the vehicle to block any harmful fuel vapors from escaping into the environment. The canister purge valve comes into play as an emission control component that enables the engine intake vacuum to take the precise amount of fuel vapors into the intake manifold.
While in modern vehicles the purge valve is electrically operated and controlled by the engine's computer. So when the engine is "off" the valve is shut, and when it is turned "on" the engine's computer opens up the purge valve.
Common problems with a faulty canister purge valveA faulty canister purge valve can cause the vehicle to have poor fuel economy, a decline in engine performance and the vehicle will run rough.