boost leak test
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1st Gear
Joined: Jan 2008
Posts: 32
From: Richmond,VA
boost leak test
So I finally got around to doing a boost leak test. I plugged and clamped the intake hose at the air filter end, plugged and clamped the pcv valve hole, and plugged the end at the throttle body with a plug with a tire valve in it. Hooked up a guage and put air in the system. I can hear air bubbling in the oil pan (I think that's where it is) and it won't hold any pressure at all. All I can figure is the air is leaking past the turbo oil seal into the oil system and into the oil pan. I've searched the forums and can't find any other explanation. Can anybody tell me if I'm right? Am I right to assume that my turbo oil seals are about shot? I have noticed a lot more turbo whine than I used to have. It'll still hold 15-16 psi boost, but doesn't seem to have that kick in the pants that it used to. It seems like if I'm right about the turbo seals, I would see more oil consumption. Haven't really noticed that.
Any opinions?
2000 ATW 1.8tq/diode mod/boost guage/mbc
Any opinions?
2000 ATW 1.8tq/diode mod/boost guage/mbc
3rd Gear
Joined: Oct 2007
Posts: 2,158
From: CT
Site Moderator
Joined: Feb 2007
Posts: 9,004
From: Nor Cal
The only and real way you can test the intake system for leaks is using the smoke test method. An adapter to the intake inlet will be set up, gas will be charged into the intake and a machine will create smoke that will leak out of any leak, even leaks that the engine managment won't pick up. If no leaks are found there isn't a boost leak, you need to look elsewhere.
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1st Gear
Joined: Jan 2008
Posts: 32
From: Richmond,VA
So I guess you can't pressurize the turbo housing? I was using something like this -
http://forums.audiworld.com/a4/msgs/1659806.phtml
http://forums.audiworld.com/a4/msgs/1659806.phtml
Site Moderator
Joined: Feb 2007
Posts: 9,004
From: Nor Cal
Thats a crap way of tesing the intake system, more complicated than it needs to be too.
How could you pressurize the turbo housing? The air would go straight through the oil return line to the bottom of the oil pan, as well as through the feed line back into the oil cooler. It doesn't matter where you inject the air, the result will be the same. Air will get though anything, thats why the smoke method works so well. I've even found leaks coming through the oil cap using that method.
How could you pressurize the turbo housing? The air would go straight through the oil return line to the bottom of the oil pan, as well as through the feed line back into the oil cooler. It doesn't matter where you inject the air, the result will be the same. Air will get though anything, thats why the smoke method works so well. I've even found leaks coming through the oil cap using that method.
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