Turbo-Evo2346

So I did a boost leak test and the air just hissed out of the top of the valve cover. Ive looked at pics of other engines and this seems to be connected to something with a hose. Could this be the source of my boost leak?

justchil

iTrader: (44)

You sure that's where it came from? I just have a breather filter on that nipple and no air comes out...

EvoDan2004

iTrader: (94)

how did you do your test?

Turbo-Evo2346

i made the thing from Vfaq's and used an air compressor. I would pump air through the device that i made and it would just hiss out the top. I wasn't sure if i should plug it or not so i didn't.

Kings Fan

iTrader: (2)

arent' you suppose to be at TDC when you do it? Just a thought

Turbo-Evo2346

TDC? sry im not familiar with that abbreviation

justchil

iTrader: (44)

TOP dead center.

I still dont see how it was coming out of the valve cover... I mean wouldnt oil come with it?

Steven

iTrader: (19)

You may check to see if it's going through the PCV valve.

C6C6CH3vo

iTrader: (9)

+1

You really should block off before the TB, but yess the PVC check valve shouldnt let air by under boost. This will cause abnormal amount of oil consumption

C6C6CH3vo

iTrader: (9)

Wait, to reallly understand why this is happening, what portion of the system are you pressurizing?

I usually apply pressure at the first IC pipe off the turbo and cap the TB pipe, and apply pressure at the BOV nipple.