Volkswagen Passat Forum banner

1 - 10 of 10 Posts

·
Registered
Joined
·
5 Posts
Discussion Starter #1
Hi, I have an 03 Passat 1.8t (everything stock) and I've been going crazy over this boost leak. I finally decided to plug the output side of the turbo and pressure test there. It seems there is air leaking into the engine block from the intake side of the turbo (I could feel air pressure coming from open end of throttle body). Also, I could hear oil dripping when I applied air pressure which leads me to believe a seal is broken and air is escaping through the oil line. Before I get a new turbo, I just wanted to confirm that this is the case.
 

·
Registered
Joined
·
26,634 Posts
You would need pull and plug the PCV from the intake tract. That allows air past the rings and maybe through the oil seal in the turbo.
 

·
Registered
Joined
·
5 Posts
Discussion Starter #3
You would need pull and plug the PCV from the intake tract. That allows air past the rings and maybe through the oil seal in the turbo.
Yes, that was already done, the only line the pressure is going into is the turbo inlet.
 

·
Registered
Joined
·
26,634 Posts
So you pressure tested the turbo? Hopefully you did not damage the seals. Did you pressure test the turbo outlet hose to the throttle body? That's the most likely source of a leak apart from the non-one-way valved hoses attached to the manifold.
 

·
Registered
Joined
·
5 Posts
Discussion Starter #7
So you pressure tested the turbo? Hopefully you did not damage the seals. Did you pressure test the turbo outlet hose to the throttle body? That's the most likely source of a leak apart from the non-one-way valved hoses attached to the manifold.
From most of what I've seen, people include the turbo in pressure testing.The turbo itself would only hold 1-2 psi so I'm thinking there's probably an issue there. When accelerating, I'm reading a peak boost of 8 psi followed by a consistent 2 psi. I will do more testing on the rest of each section this weekend when I have time.
 

·
Registered
Joined
·
26,634 Posts
Are you loosing any oil? The turbo should hold higher as most people test to 15psi or so. I've only tested mine once as I had a V6 for a 10years in between the turbo engine. 8psi is good, but it should not drop that low until near redline.
 

·
Registered
Joined
·
5 Posts
Discussion Starter #9
Are you loosing any oil? The turbo should hold higher as most people test to 15psi or so. I've only tested mine once as I had a V6 for a 10years in between the turbo engine. 8psi is good, but it should not drop that low until near redline.
I don't seem to be losing any oil
 

·
Registered
Joined
·
26,634 Posts
With the engine running, you would not have a boost leak inside the turbo as the oil pressure is higher than the boost. Since you are not loosing oil, the turbo seals are good.
 
1 - 10 of 10 Posts
Top