LIFER

iTrader: (16)

Ok let me keep this short and to the point, today i did a boost leak test and lines would not pressurize due to all air leaking out the exhaust! am I stupid, or is something wrong? I could build 0 boost pressure

kmcconn9

iTrader: (33)

I think your post was a little too short...

I am ssuming that you were using a standard boost leak tester at the turbo inlet correct?

If so, you will get some eventual leaking of pressure thru the exhaust, but not enough to get a solid reading on your gauge..

fsugatorbait

iTrader: (16)

Cap your UICP at the throttle body.

kmcconn9

iTrader: (33)

I would have to guess that your problem lies in the lower intercooler pipe. I forgot to tighten my clamps when I was reinstalling my lower intercooler pipe and got nothing on my gauge from the leak test. Wondering what the problem was, I checked where I was a sure enough the clamps were not tightened.

kmcconn9

iTrader: (33)

why woudl you want to do this? If you did then how would you check for leaks on the UIP? You should be fine with just taking off the intake, and testing the system as it.

If you are getting no pressure reading on the gauge, it has to be a major leak..

Spaceball 1

iTrader: (8)

plug the UICP

fsugatorbait

iTrader: (16)

Capping it at the TB prevents the compressed air from venting through the motor. Your not preventing anything by capping it.

fsugatorbait

iTrader: (16)

How does him having air leaking from his exhaust trace back to a LICP issue?

LIFER

iTrader: (16)

Ok all my air is leaking through the exhaust!!! I have done this test before without capping off the TB and have been able to build full boost in the lines with no air leaking through the exhaust.. my question is why now is it all leaking out?

robertrinaustin

iTrader: (5)

You cap it at the throttle body as the original post stated. That is at the end of the uip, so you'll know if there are leaks in the uip. If you don't cap it, you'll loose too much pressure through the exhaust.

kmcconn9

iTrader: (33)

it seemed to me that he wasnt sure IF it was leaking out of his exhaust...thus the reason I mentioned the intercooler pipe solution..

The air will still pressurize regardless if the UIP is blocked off of not.

fsugatorbait

iTrader: (16)

I believe the motor has to be at TDC for this to happen.

Spaceball 1

iTrader: (8)

you really think the throttle blade will make a perfect seal? what about the idle air control valve too If you have done it before without air coming out the exhaust You just getting lucky that the correct combination of valves are closed

Deepseadiver

iTrader: (3)

It's not that hard too turn the engine to TDC.

kmcconn9

iTrader: (33)

the point is, that regardless if the UIP is sealed or not, the system will still pressurize...

I understand how to do a boost leak test and how it works, this isnt what this post is about. We are simply trying to find the source of the leak...I'm not trying to sound like an a*s here.