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Old 07-09-2006, 11:01 PM   #1
ScoobySnacker
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Default Boost leak test??Can't get the system to pressurize?

So, i have a leak somewhere and cant find it for the life of me. I borrowed my brothers pressure tester, hooked it up to the inlet hoses, plugged the 3 ventilation ports on the top and i couldnt get the system to pressurize? My boost gauge didnt even move. I gave up and decided to come to the forums. Thanks in advance!
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Old 07-09-2006, 11:07 PM   #2
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Quote:
Originally Posted by ScoobySnacker
So, i have a leak somewhere and cant find it for the life of me. I borrowed my brothers pressure tester, hooked it up to the inlet hoses, plugged the 3 ventilation ports on the top and i couldnt get the system to pressurize? My boost gauge didnt even move. I gave up and decided to come to the forums. Thanks in advance!
Do you have a stock inlet hose? if so there are 4 ventilation ports...

-D
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Old 07-09-2006, 11:07 PM   #3
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Quote:
Originally Posted by ScoobySnacker
So, i have a leak somewhere and cant find it for the life of me. I borrowed my brothers pressure tester, hooked it up to the inlet hoses, plugged the 3 ventilation ports on the top and i couldnt get the system to pressurize? My boost gauge didnt even move. I gave up and decided to come to the forums. Thanks in advance!
Did you use an air tank of some sort or did you just try plugging an air compressor right into the intake tract? If you just tried using a compressor, it'll take forever to pressurize it, (especially if you have a leak somewhere! )

You need to fill an air tank up to 15-20 psi max and then tie that into your intake tract to listen for leaks. I found a small compressor with a tank attached in Wal mart that worked well.
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Old 07-09-2006, 11:07 PM   #4
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I have tried a smoke machine and Home Depot type test and can't find my boost leak either. Although I didn't try anything involving those 3 ventilation ports...
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Old 07-09-2006, 11:13 PM   #5
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It takes a while for the system to pressurize. I was suprized how much air I had to put in to see anything. You need to put in a lot more volume then you might think.
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Old 07-09-2006, 11:26 PM   #6
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I have a stock inlet hose and could only find 3 ports on the top? I used a 60 gallon air tank. Put the home made boost leak tester on the inlet and tried to pressurize it. Nothing at all. I could hear nothing and the boost gauge did not move. Do all four ports need to be plugged? Thanks guys!
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Old 07-10-2006, 10:55 AM   #7
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Bump...I need some help
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Old 07-10-2006, 11:52 PM   #8
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Bump it up again..i plugged all four ports today and it did the same thing..im starting to get frustrated
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Old 07-11-2006, 12:18 AM   #9
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i havent been able to get mine to work either. I dont see why a compressor wouldnt work. Do you have to take the hoses off the inlet hose and plug them with a cap and then do it, or can i just leave the hoses on?
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Old 07-11-2006, 12:58 AM   #10
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Did you listen at the exhaust pipe?

You could either have a bent valve that is bleeding boost out the exhaust or the engine is stopped in valve overlap and you losing pressure through a cylinder.


Try bumping the starter to rockthe engine over a part of a revolution and see if the intake will pressurize.

Larry
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Old 07-11-2006, 09:16 AM   #11
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Quote:
Originally Posted by hotrod
Did you listen at the exhaust pipe?

You could either have a bent valve that is bleeding boost out the exhaust or the engine is stopped in valve overlap and you losing pressure through a cylinder.


Try bumping the starter to rockthe engine over a part of a revolution and see if the intake will pressurize.

Larry
You are starting to scare me, ALOT!...I dont see why i could have a bent valve with only 50K and just a reflash. Doesnt seem like that would be possible, but you never know. I will listen to the exhaust and let you know what happens. Is there any other way to confirm that i could have a bent valve, other than ripping the engine apart? Thanks for the help guys!
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Old 07-11-2006, 09:38 AM   #12
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To add to my last post..The car runs fine and i think that i would notice if there was a bent valve or something wrong internally. Bump for more help!
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Old 07-11-2006, 09:46 AM   #13
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electronic boost gauge? is your key on?
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Old 07-11-2006, 10:21 AM   #14
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Quote:
You are starting to scare me, ALOT!...I dont see why i could have a bent valve with only 50K and just a reflash.
Not trying to scare you and have no reason to believe you have a bent valve just stating the two most obvious reasons you might not be able to pressurized the intake tract. You have a very big leak the most likely is that not all the valves are completely closed and there are only 2 likely reasons for that to happen. The very benign case where by simple dumb luck the engine stopped with one cylinder at a point where both the intake and exhaust valves on that cylinder are off the valve seats. If that is the case all you need to do is rotate the engine a few degrees and the problem goes away.

If you are applying air to the system and it is leaking past the valves you will be able to hear and feel the escaping air out the exhaust pipe.

I mentioned a bent valve as it is a possibility although very slight.

By the way if the boost gauge is reading pressure off the intake manifold and the throttle is closed it will take a loooooong time for the pressure to build in the intake manifold enough to show on the boost gauge.

Larry
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Old 07-11-2006, 11:05 AM   #15
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I got what you are saying...I have tried it more than once, so i dont think if had the same dumb luck each time with the intake and exhaust valves of one cylinder is off the seat. I think that i may not holding the compressor on long enough for the system to pressurize. I know that when my brother and i did his SRT-4, we hooked the pressure tester up and almost instantly the boost gauge went up. What makes the Subaru so different? Thanks for all the help I will keep it updated. And i have a mechanical boost gauge, so that is not the problem.
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