whipplenight
Junior Member
Hello, long story short I was getting a cylinder 8 misfire I went to swap coils and plugs and I found the problem staring at me. The whipple had a puddle of oil sitting behind the throttle body! The catch was filling up very quickly and putting oil back into the intake. So I decided to run a metco oil cap breather with check valve and after installing it I noticed something strange, the one way valve was being held down as if it was under vacuum...I put my hand over where the oil cap would be and it was definitely sucking air...I’m running a catch can one hose to PCV and one hose to whipple barb behind throttle body. I’ve blocked off the factory barb under the oil cap whipple designed this to run from the barb to the air box. I have a carbon fiber intake so this wasn’t possible so I just ran a hose and filter on it, but after getting the metco breather I capped off this fitting. Any ideas on why I’m under vacuum? To my knowledge I should be releasing crank case pressure not sucking air...