Hi all, we fixing a punto ( evo?) 199 engine 1.2 petrol build 2014, now we going to put a custom build short air intake on it because the standard airbox is a little cracked and ist very expensive to buy a new plastic box 
. Just to test it out. Now there are 2 rubber hoses connected to the standard airbox, the big one is for the positive cranckcase vent system that we know. But what is the small one for? It goes down behind the airbox into the intake manifold. Is this for helping sucking out the fumes that comes from the PCV ? Or is this something else?
. Just to test it out. Now there are 2 rubber hoses connected to the standard airbox, the big one is for the positive cranckcase vent system that we know. But what is the small one for? It goes down behind the airbox into the intake manifold. Is this for helping sucking out the fumes that comes from the PCV ? Or is this something else?