 How to check for vacuum leaks, What are the tips and tricks ? |
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| 913B |
 Oct 31 2014, 06:15 PM
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#1
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Senior Member  Group: Members Posts: 856 Joined: 25-April 05 From: South Bay/SoCal Member No.: 3,983 Region Association: None  |
From the last time I tried with the engine running and spraying carb cleaner everywhere and causing a big mess. I did not really see a big RPM difference, maybe I was doing it wrong, maybe I was expecting too big a change and moved on too quickly, but nothing really came from it. I still suffer from a periodic hi idle (1500 rpm), sometimes it idles fine at 800. If it was a vacuum leak why did it correct itself and sometimes idle at 800 ? I have since removed the AAR and even swapped out the MPS with another one, no difference. Stock 1.7 FI
So the discussion for today is what is the proper method, tips and tricks to perform a good vacuum leak check. I am tempted to make a DIY homemade smoke machine from watching youtube to blow smoke in my FI system and check it that way ?? Thoughts (IMG:style_emoticons/default/popcorn[1].gif) (IMG:style_emoticons/default/popcorn[1].gif) |
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| cary |
Nov 1 2014, 08:52 AM
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#2
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Advanced Member Group: Members Posts: 3,900 Joined: 26-January 04 From: Sherwood Oregon Member No.: 1,608 Region Association: Pacific Northwest 
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I built a smoke generator out of a paint bucket. It was built to find a manifold leak on a 4.0 Ford explorer. Basically you light a rag soaked with WD40 to create the smoke. Put the lid on it and push the smoke into the intake with air pressure. Found the leaking seal in about 30 seconds.
You got me thinking what air pressure did I use. I'll have to see if I wrote it on the top of the can. I'll shoot a picture of it today. I have a long hose attached to a torch nozzle too. I can never get that test to work. My .02c. |
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| 913B |
Nov 1 2014, 11:51 AM
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#3
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Senior Member Group: Members Posts: 856 Joined: 25-April 05 From: South Bay/SoCal Member No.: 3,983 Region Association: None |
QUOTE(cary @ Nov 1 2014, 07:52 AM)  I built a smoke generator out of a paint bucket. It was built to find a manifold leak on a 4.0 Ford explorer. Basically you light a rag soaked with WD40 to create the smoke. Put the lid on it and push the smoke into the intake with air pressure. Found the leaking seal in about 30 seconds. You got me thinking what air pressure did I use. I'll have to see if I wrote it on the top of the can. I'll shoot a picture of it today. I have a long hose attached to a torch nozzle too. I can never get that test to work. My .02c. I was going to attach a tire pump to the can like the video, would that be too high of pressure ? Thanks for the pic |
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Posts in this topic
porsche913b_sp How to check for vacuum leaks Oct 31 2014, 06:15 PM
02loftsmoor
From the last time I tried with the engine runnin... Oct 31 2014, 06:25 PM bdstone914 I have not tried it but using a non lite propane t... Oct 31 2014, 06:47 PM 76-914 or a spray with water and look for an idle drop. Oct 31 2014, 07:03 PM porsche913b_sp I was thinking of something similiar to this with ... Oct 31 2014, 07:46 PM Jeff Bowlsby How a bout a smoke pen? a vacuum leak would visib... Oct 31 2014, 08:35 PM Chris Pincetich :toke:
:rolleyes:
:beer2: Oct 31 2014, 11:08 PM a few loose screws As far as the combustible methods go, personally I... Nov 1 2014, 03:57 AM r_towle Go back to the issue.
A periodic high idle , in my... Nov 1 2014, 08:54 AM
RobW
Go back to the issue.
A periodic high idle , in m... Nov 1 2014, 09:00 AM
porsche913b_sp
Go back to the issue.
A periodic high idle , in m... Nov 1 2014, 11:54 AM boxsterfan My idle problems went away with a new CHT and spac... Nov 1 2014, 11:16 PM BeatNavy
My idle problems went away with a new CHT and spa... Nov 2 2014, 05:30 AM porsche913b_sp whats the spacer ? Nov 2 2014, 12:11 AM Porschef An adapter essentially that goes between the CHT s... Nov 2 2014, 05:10 AM |
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