Before i pulled my engine, i realized that this thing(hose) was disconnected on the back my Si motor, the hose was just dangling there and i was wondering if this could be a cause of making the motor run like poop. Ive been told is it called an oil separator or somthing that holds the PCV valve or somthing.

 

it goes to your pcv valve,on you intake manifold.i took mine off and put a k&n breather on my valve cover.mine runs fine.

 

it may run fine now but honda didnt attach the hose to the intake manifold for ***** and grins.