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Old 03-04-2008, 03:33 PM   #26
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clamp off hose
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Old 03-04-2008, 03:45 PM   #27
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I did block off the PCV hose hole that goes into the AMM to turbo pipe, but i left the PCV side sitting free, that's where I felt the slight positive pressure. Should i block that side too? intuition says no, as i could blow out seals..
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Old 03-04-2008, 04:24 PM   #28
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BUT did you unhook the vacuum supply hose that goes to the flametrap? You'll get pressure from the manifold and out the larger PCV hose that way. Don't ask me how I know....
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Old 03-04-2008, 05:06 PM   #29
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lol, no i didn't. That's probably the key. Hopefully I didn't blow any seals. Thanks!!
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Old 03-04-2008, 05:27 PM   #30
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If you blew seals you've got other issues to worry about. The amount of air going in via the PCV vacuum line won't be enough to be an issue. Any other air is simply air that's getting past the rings or valve guides, both of which you'll have much higher pressures under normal engine operating conditions.
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Old 05-19-2008, 10:01 PM   #31
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I bought a metal/rubber plug at Ace today, jammed it into the AMM hose (headed towards the turbo inlet) and fed air in thru the PCV breather hose. I couldn't hear any air escaping from anywhere, but it certainly wasn't holding any pressure. If I held my thumb over the PCV tube then it would build a little pressure. But the pressure goes away in about 2 seconds if I move my thumb or not.

I was using a smallish air supply tip so maybe that was part of the problem. I'll try it again with a full air supply (LOL! I said Air Supply) like was shown in the original post.

Any ideas from what I've seen so far?
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Old 05-19-2008, 10:55 PM   #32
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Is test cap the official name for that one part? Maybe it's just the ignorant schmuks in my Home Depot, but no one had ever even heard of one.
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Old 05-19-2008, 11:54 PM   #33
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i found mine at lowes
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Old 05-19-2008, 11:58 PM   #34
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Cleanout cap or just a plain cap, depends on what you're looking for.

Without capping the throttle body end of the intake tract you'll still be losing air thru various ports on the manifold, plus thru the one or two open valves and out thru the exhaust. Now if you pull the cam you can deal with that leak as well.
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Old 05-20-2008, 12:25 AM   #35
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Is test cap the official name for that one part? Maybe it's just the ignorant schmuks in my Home Depot, but no one had ever even heard of one.
They're usually found on the same isle as the ABS and PVC. They use similar caps for wells so you might ask for a well cap.
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Old 05-20-2008, 01:48 AM   #36
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Nearly every Home Depot i've been in seems to have the test cap in question... though few people who work there seem to know a damned thing... a shame, really.
Home Depot USED to have knowledgeable people in all their departments... and pay 'em pretty well. then they fired everyone. There are still the scattered well-informed people, but they're getting fewer and and farer in between...

Anybody local (PDX) who'd like to borrow it is welcome to... just drop me a PM. can take it with you and return it, or go ghetto fab style and use it in front of my house... and if'n ya feel like bringing a beer, i drink Iron City (or anything, really).
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Old 05-20-2008, 09:07 AM   #37
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The PVC cap and the test plug were almost the same price... ~5 bucks. I opted for the metal adjustable piece rather than trying to figure out which plug I really needed.

OK, so I need to cap off the throttle body side to really see if I have leaks? Doesn't that just mean that my TB doesn't close properly - or is it supposed to leak a little?

What about the IAC? Crimp/plug that too?
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Old 05-20-2008, 12:37 PM   #38
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you might have intake gasket or injector leaks too, food for thought. just up the pressure
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Old 05-20-2008, 09:50 PM   #39
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I ran it up to about 40 PSI, but it still leaked right out. Gonna try blocking off the hose at the TB and see what that does.
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Old 05-21-2008, 02:26 AM   #40
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This thing looks f*ckin' awesome!
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Old 06-07-2008, 03:35 AM   #41
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i realize that this is for checking the turbo lines and such. would this work for checking all the vacuum lines also? like hooking it up to the intake tube after the intercooler?
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Old 06-07-2008, 04:11 AM   #42
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Yes, it will leak test just about everything in the intake system, when I did mine I actually just disconnected the top hose coming from the turbo, found the base of a cup fit in the hose, then tighten the clap again.
To pressurise the system I pulled a vac hose and shoved the air duster fitting from my compressor into it, that was back when I found my idle air control hose was leaking, and it was one of those leaks you probably would have never found without a pressure test.
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Old 06-07-2008, 06:09 AM   #43
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Yah know, at first i was thinking, "very good quite professional good job" and i started to wonder where i was. I felt like i wasnt here anymore. and then i scrolled down....

"will a bike pump work?"
"i used cardboard and duct tape"

Oh yeah now i remember.. TB should stand for ghetto.
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Old 06-07-2008, 08:57 AM   #44
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to add.

this also works for n/a cars.

just turn off the compressor at like 2 psi.
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Old 10-20-2008, 10:25 PM   #45
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Bump so mo peeps see the goodness!
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Old 10-20-2008, 11:53 PM   #46
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to add.
this also works for n/a cars.
just turn off the compressor at like 2 psi.
Go ahead and give that na car the same boost.

I am inspired. I'm gonna build one of these while I am looking for MBC parts.
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Old 10-21-2008, 12:12 AM   #47
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yes, this needs to be done to the silver 88 765ti...soon!
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Old 10-22-2008, 03:28 AM   #48
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I built mine today (well, yesterday now).

Used a piece of galvanized fitting that fit right in the amm -> turbo hose and a plastic cap.
I put a valve stem in the cap, and used a gauge hooked into the vacuum line that runs to the charcoal canister.

Worked perfectly, found two leaks, and confirmed the third I knew was there.
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Old 10-23-2008, 05:19 AM   #49
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This is great! I'm just about to finish up on my headgasket repair job, this will come in handy when I get everything back together! I <3 homebrew tools!
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Old 06-24-2009, 10:35 PM   #50
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Hey,
I went out to the Depot today and got the stuff to build one of these fancy boost leak testers (although prices are up! Almost 20CAD). Great idea, thanks dhallilama. I've got an 84 245Ti... B21ft with intercooler. What hoses will have to be capped off to use this properly? Do I simply cap off the PCV hose that runs over the valve cover? Have people found it necessary to block off after the TB?
Thanks!
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