Originally Posted by JITB
nothing!
The hose people always disconnect(and put a breather filter on), is supposed to be a vent, for the valvecover, and circulate fumes from inside of the Valve cover, out thru the Pcv valve, and into the Intake manifold.
It used the vaccum from the IM/Intake hose.. to do this... So when people just disconnect the hose, and throw a breather filter on it... the fumes cant be circulated and filtered.. properly..
Look at the hose, connected to the intake hose.. thats where people always put a breather filter on..... instead of using a correct Intake setup that lets the vaccum work like its supposed to!