boost leak testing
 

Ok i went to home depot and made my self a boost leak tester. Today i hooked it up to the car and started to pump the pressure... moments later i start to hear a bubbling noise sounded like the oil. I capped off the tb hose with pvc pipe the air intake hose with pvc pipe and capped off where the pancake valve goes. my question is why does the oil sound like it is bubbling? is this normal or is it bad? please help i need to find this boost leak it makes a mad hiss sound at WOT.

Thanks

RE: boost leak testing
 

Can you verify with your boost gauge while driving that you have a boost leak? Or do you just think this because of the hissing at wot?