Another way to find Vaccum Leaks???
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Joined: Mar 2007
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From: Canton, GA
Another way to find Vaccum Leaks???
Anyone know how else to find a vaccum leak? I tried having having the car idle and spraying Carb+Choke cleaner on it and nothing. I know I have a vaccum leak for sure. Use to idle at -20vac and now at -10vac, and besides that, the BOV doesnt work. I know the BOV has vaccum to it and I just bought a new BOV and still doesnt work. My guess is a vaccum leak. Anyone know an EASY way to nail a vaccum leak. I can even hear it, just cant find the stupid thing.
Automatic = Power drain
Joined: Nov 2006
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From: Pennsylvania
Sometimes you can pressurize the intake and spray soapy water around.
I don't think this is necessary if you can hear the vacuum leak, I would just move around the car until it is the loudest and then simply move each vacuum line in turn to see if the sound changes, when it does, you found the leaking hose.
I don't think this is necessary if you can hear the vacuum leak, I would just move around the car until it is the loudest and then simply move each vacuum line in turn to see if the sound changes, when it does, you found the leaking hose.
try this.
take an unlit propane torch, crack the valve open and use it to probe around the engine where you think the leak is, you'll hear the engine pick up rpm when your on top of it. it's pretty precise and doen't get your engine covered in flammable liquids or water. It helped me.
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Thread Starter
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Joined: Mar 2007
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From: Canton, GA
Yes they are both t-ed together. Is that a problem? And both run to a vac nipple of the UIM. Is that not good? I know I have vaccum though to the BOV. I can pull the hose off the bov and it would stick to my finger.
no, that's what you want..... again, what is not working about the BOV, it's not opening?
I'm a boost creep...
Joined: Jan 2002
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From: Auckland, New Zealand
If you have a compressor, read this:
https://www.rx7club.com/2nd-generation-specific-1986-1992-17/water-sensors-water-pump-diff-models-583211/ (Scroll down to posts #11 and #16)
https://www.rx7club.com/2nd-generation-specific-1986-1992-17/water-sensors-water-pump-diff-models-583211/ (Scroll down to posts #11 and #16)
Thread Starter
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Joined: Mar 2007
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From: Canton, GA
Well today I noticed something that might be the problem. Before I installed my FMIC there is the stock hose that runs to a nipple right next to the stock bov/setup, that short and pretty big hose. Anyway, when I putting the fmic, that hose had like an inline 'fuel filter-type' look alike. But this one is solid grey and has an arrow pointing in one direction. Is this neccesary to keep in that line? I just eliminated it and but a hose from the UIM/ vaccum source (stock) to a nipple I tapped into the intercooler piping connected to the turbo. Is it neccesary to have?
Haven't we ALL heard this
Joined: Mar 2001
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From: Indiana
If you have a compressor, read this:
https://www.rx7club.com/showthread.php?t=583211 (Scroll down to posts #11 and #16)
https://www.rx7club.com/showthread.php?t=583211 (Scroll down to posts #11 and #16)
Thread Starter
Senior Member
Joined: Mar 2007
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From: Canton, GA
So do I need that one-way check valve in? Does that have anything to do with the bov not working?
http://www.boostpro.net/prodtester.html
If you do not want to fabricate your own, this website sells pressure testers. You just need to buy a coupler. They also have one with a tire valve connector on it. So you will not have to buy an expensive impact-tool grade compressor to make this work.
If you do not want to fabricate your own, this website sells pressure testers. You just need to buy a coupler. They also have one with a tire valve connector on it. So you will not have to buy an expensive impact-tool grade compressor to make this work.
I'm a boost creep...
Joined: Jan 2002
Posts: 15,608
Likes: 8
From: Auckland, New Zealand
Thread Starter
Senior Member
Joined: Mar 2007
Posts: 301
Likes: 0
From: Canton, GA
http://www.boostpro.net/prodtester.html
If you do not want to fabricate your own, this website sells pressure testers. You just need to buy a coupler. They also have one with a tire valve connector on it. So you will not have to buy an expensive impact-tool grade compressor to make this work.
If you do not want to fabricate your own, this website sells pressure testers. You just need to buy a coupler. They also have one with a tire valve connector on it. So you will not have to buy an expensive impact-tool grade compressor to make this work.
It pressures your entire engine. Think about it, the air goes through the intercooler pipes into the intake manifold, which is connected to all your vacuum hoses etc. Read that link that NZconvertible posted up.
I have it, although I haven't used it yet because I need a reducer to make it work with my turbo. I've helped my friend use a similar one on his VR-4, and you would be amazed how many little bullshit leaks can develop.
I have it, although I haven't used it yet because I need a reducer to make it work with my turbo. I've helped my friend use a similar one on his VR-4, and you would be amazed how many little bullshit leaks can develop.
Thread Starter
Senior Member
Joined: Mar 2007
Posts: 301
Likes: 0
From: Canton, GA
It pressures your entire engine. Think about it, the air goes through the intercooler pipes into the intake manifold, which is connected to all your vacuum hoses etc. Read that link that NZconvertible posted up.
I have it, although I haven't used it yet because I need a reducer to make it work with my turbo. I've helped my friend use a similar one on his VR-4, and you would be amazed how many little bullshit leaks can develop.
I have it, although I haven't used it yet because I need a reducer to make it work with my turbo. I've helped my friend use a similar one on his VR-4, and you would be amazed how many little bullshit leaks can develop.