 Surging and Unsettled Idel after MPS Rebuild, '74 2.0L D-Jet |
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| R Shaff |
 Apr 2 2017, 05:00 PM
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#21
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Newbie  Group: Members Posts: 10 Joined: 16-March 17 From: Charlotte, NC Member No.: 20,936 Region Association: South East States  |
I know this is an old thread, but for anyone who wonders about intake leaks, the cigar smoke test is cheap, easy, and can be done at home. Light the cigar and take long slow draws on it to let the smoke collect in your mouth, then blow the smoke from your mouth into the intake. On this car (mine's a '72 1.7L), I disconnect the PCV hose and blow into it. Then once the intake has plenty of smoke in it, I blow harder to see if the smoke comes out anyplace but the air cleaner.
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| Rand |
Apr 2 2017, 05:11 PM
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#22
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
QUOTE(R Shaff @ Apr 2 2017, 03:00 PM)  I know this is an old thread, but for anyone who wonders about intake leaks, the cigar smoke test is cheap, easy, and can be done at home. Light the cigar and take long slow draws on it to let the smoke collect in your mouth, then blow the smoke from your mouth into the intake. On this car (mine's a '72 1.7L), I disconnect the PCV hose and blow into it. Then once the intake has plenty of smoke in it, I blow harder to see if the smoke comes out anyplace but the air cleaner. Curious. You'd have to cap the throttle body air tight, or it would just come out there. Seems like it would need to resist some pressure. Did you seal it or just use your palm or what? Is this a theory, or has it actually helped you find an intake leak? Interesting idea. |
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| r_towle |
Apr 2 2017, 07:04 PM
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#23
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Custom Member Group: Members Posts: 24,573 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States 
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What kind of cigar?
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| Tbrown4x4 |
Apr 3 2017, 07:14 AM
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#24
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Senior Member Group: Members Posts: 703 Joined: 13-May 14 From: Port Orchard, WA Member No.: 17,338 Region Association: None
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A friend of mine built a smoke tester with a coffee can, a fat wick and some baby oil. He wrapped nichrome wire around the wick and hooked it up to 12v with alligator clips, and put regulated shop air (5-10 PSI?). I'll try to get details later, but it worked well for finding odd leaks.
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| cary |
Apr 3 2017, 07:53 AM
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#25
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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 one with a new paint can. Worked great to find a vacuum leak on a Ford 4.0. I got the design off You Tube. Haven't used it on a 914 yet, but plan to when the need arises.
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