ok, i just read the whole thread today. i think what happened to me is just like what happened to people above. i think its leaking through the intake valves to the exhaust valves.i think i should correct myself. it sounded like it leak through the turbo, but i think it was leaked through the motor. i blocked the hose in front of the throttle body.
Can anyone elaborate on what Bryan is saying regarding the blowing out the rear/front main seals (so DON'T put a cap on these)? How are we supposed to see any pressure then (if it's vented to the atmosphere)?You should be able to bring pressure up to at least what your turbo boosts to, however there is one part I dont agree with from what has been said so far...
I would highly recommend disconnecting anything plumbed to the intake that doesnt normally see positive pressure. You could potentially blow out a main seal if you dont, and the 2JZs are prone to that anyway so I wouldnt want to do anything to risk it.
Anything after the turbo sees boost so thats not a concern. Just disconnect whatever lines you have running to the intake such as crankcase breather, charcoal canister, etc etc (if you have any of them) and boost away... I actually prefer to bring the boost up to the level that the car sees to do a full test, and have found leaks that dont reveal themselves until higher pressure in the past.