hey guys,

i know this is on here all the time, but i built the components to do a pressure test on my boost lines in my 02 s4. i must be missing something. when i go to fill the system, it sounds like the air is just rushing into my intake manifold. is there something i have to do with the throttle body? or maybe you guys know of a good post for a diy on the system test? and.... i don't have an air compressor.... so i'm using co2.... i wouldn't think it would be bad for the system... i'm hoping it won't screw up any sensors, right??
any help would be greatly appreciated! thanks!

 

at what point are you charging the system?

 

just upstream of the y on the intake.