Components which will have an effect on the efficiency of a canister purge valve include things like unclean valve problems and valve blockage. Valve blockage is brought on when an obstruction turns into lodged while in the opening of the valve, creating a backup of the fuel and air combination. http://keeganarerd.tblogz.com/the-fact-about-purge-valve-that-no-one-is-suggesting-9068109