vice

on our cars, the air pump goes to a valve, i dunno what the valve is called or what it does exactly. but then theres a hose coming out of that valve and leads to a canister under teh passenger side headlight. has anyone ever disconnected that hose from the valve opening and run their engine? it sounds like a lawnmower just got stuffed into your engine bay. its louder than the engine and quiets down slower. anyways, just wonderin what that valve is and if anyone likes the noise it makes when you take off that hose.