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Ultimate Vacuum Leak Test

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Old 05-05-04, 09:36 PM
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Ultimate Vacuum Leak Test

I tried all the methods and this by far worked the best. This is it, an air compressor, some fitting adapters and Mr. Bubble solution (50% liquid bubble bath and 50% water).

Put a rubber 2-1/2" home depot coupling and end plug into the rubber coupling on the AFM. Plug the end with an end cap and 1" female npt port. Add a 1" to 1/4" pipe bushing and plug in your air hose (and use some teflon tape).

I initially set the pressure to 5 psi and first go found eight--yes that's (8) leaks. Spray the Mr Bubbles wherever you want, but especially on fittings and gaskets. Oh yea--only do this on a cold engine. No way in hell I would have found them without it. When you're done just rinse it off with water.

Still have a massive leak on the freakin thermal wax unit--that means I gotta take off the POS PITA throttle body. This one is so bad I could hear it. Even after knowing where it is I sprayed starting fluid on it and had no effect.

Even some of the bushings around the throttle plate shafts are showing bubbles. Right now I'm just going for the big ones. Once I get the big ones fixed I'm gonna go for 12 psi and see what else bubbles.

Hope this helps someone in the future.

Scott
Old 05-05-04, 09:42 PM
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The forum won't let me upload the 95 kb pic so you'll have to wait.

Scott
Old 05-05-04, 10:02 PM
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even w/o pics, that's a help. thanks for sharing.
Old 05-05-04, 11:54 PM
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that method works great!
Old 05-06-04, 12:53 AM
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good method tried and true.
Old 05-06-04, 01:35 AM
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could yo draw a picture or have clearer instrucations on how you did this??
cause do not unserstand howyou applu mr bubbles??

do you spray on to the vacumm lines/gasket areas on the engine??
Old 05-06-04, 08:33 AM
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cool idea.
Old 05-06-04, 08:44 AM
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bump, yeah I want to see how this is done too!
Old 05-06-04, 09:21 AM
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you dont have to spray even, just get the house wet with the solution, it makes little white foam/bubbles where air is escaping.
also works on tires =)
Old 05-06-04, 10:18 AM
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https://www.rx7club.com/showthread.p...ighlight=leaks

Sounds like this.
Old 05-06-04, 11:12 AM
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sounds like a good idea to me!
Old 05-06-04, 08:39 PM
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Originally posted by Josepi

https://www.rx7club.com/showthread.p...highlight=leaks

Sounds like this.
Yep--that's exactly what I'm talking about. Good pics too, so I don't need to upload any photo's, look at the ones in the thread above.

Oh Josepi, how well did your system end up holding pressure? Does it end up bleed out thru the engine/exhaust?

Scott
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