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First time smoke testing for vacuum leaks

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Old Sep 9, 2025 | 10:47 AM
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From: CT
First time smoke testing for vacuum leaks

Looking to purchase a smoke machine.

What PSI should i run thru the system?
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Old Sep 9, 2025 | 10:54 PM
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Whatever your target boost is if you have the option. Keep in mind the position of the rotor may or may not allow for that pressure to be sustained. Realistically, a vacuum leak will be evident a 0 psi with a smoke machine.

You dont NEED to pressurize the system. Just run the smoke and look for it. A laser or a halogen flashlight helps if the leak is really small. Typically you can just see it without any assistance.
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Old Sep 10, 2025 | 09:09 AM
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From: CT
Originally Posted by FDAUTO
Whatever your target boost is if you have the option. Keep in mind the position of the rotor may or may not allow for that pressure to be sustained. Realistically, a vacuum leak will be evident a 0 psi with a smoke machine.

You dont NEED to pressurize the system. Just run the smoke and look for it. A laser or a halogen flashlight helps if the leak is really small. Typically you can just see it without any assistance.
perfect. ty


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Old Sep 10, 2025 | 12:14 PM
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let us know which one you buy and how the test goes. i should do this to my car.
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Old Sep 10, 2025 | 01:44 PM
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Originally Posted by gracer7-rx7
let us know which one you buy and how the test goes. i should do this to my car.
i got this one
Amazon Amazon

its going to make a lot of smoke and is very popular. SHIPS SAME day from amazon. has a great website. has tons of adapters and so on

BYT! in hindsight i would get one that produces more PSI. This one hooks up to a compressor which i p[refer. but regulates down to 1psi

And i think everyone should test their car occassionally. tighten it up! right!
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Old Sep 14, 2025 | 11:21 AM
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I did this last year to find a vacuum leak, it worked great.

This is the smoke machine (was $200 a year ago)
Foxwell Smoke Machine Foxwell Smoke Machine

I capped off the intake piping, removed some vacuum/pressure lines and capped them.

As for psi, I do not recall, it really didn't take much pressure to discover the now obvious leak.

The leak was due to poor sealing of a block off plate under the UIM. That was easily rectified.

Here is a link to a few pics.
Smoke Machine for Vacuum Leaks



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Old Sep 14, 2025 | 03:47 PM
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“Now obvious”. So true

I ended up finding mine by spraying carb cleaner. It was very obvious

Originally Posted by jkstill
I did this last year to find a vacuum leak, it worked great.

This is the smoke machine (was $200 a year ago)
Foxwell Smoke Machine

I capped off the intake piping, removed some vacuum/pressure lines and capped them.

As for psi, I do not recall, it really didn't take much pressure to discover the now obvious leak.

The leak was due to poor sealing of a block off plate under the UIM. That was easily rectified.

Here is a link to a few pics.
Smoke Machine for Vacuum Leaks
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