i have a d15b2 and a b18a1 and both of them the pcv valve is not connected because it broke both times and i just left the big hole in the thing under the intake manifold. is this ok or is it gonna cause some probs in the future. thanks.

 

you need PCV valves,,. It doesn't rob your power at all. And if you left big hole on valve cover, engine oil gonna leak crazy. I suggest you to get new one it only cost you around$5. hope this helps.

 

yes you do need it its a positive crankcase ventilation valve that helps the engine clear out blowby gases