Posts: 79
From:Friendswood, Texas
Registered: Sep 2000

posted 09-28-2000 07:31 PM               

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Whats the best way to detect a vacuum leak?

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Ted
Friendswood,Tx.

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Posts: 1350
From:Rohnert Park, CA USA M&M member#591
Registered: Jul 2000

posted 09-29-2000 01:18 PM               

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I am eager to hear the answer too.
I never have had a serious leak that wasn't related to me forgetting to put a hose back on.
I have heard of a saop an water concotion sprayed around wher you think the leak is and
if you get bubbles, its most likely leaking there.
Others have said to spray carb cleaner around the area and if the idle picks up then drops back down you found one. The carb cleaner is supped to momentarily stop the leak.
I don't know that I trust either method, but I have found none better...

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Marcus
Fast, Reliable, Cheap.... Pick any TWO of these words.
68 Mustang, still in purgatory.
BOYCOTT EXCESSIVE MOTORSPORTS

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Posts: 79
From:Friendswood, Texas
Registered: Sep 2000

posted 09-29-2000 02:40 PM               

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I have heard propane is good to use. I just don't know if the idle gets faster or slower if their is a leak.tedster

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Ted
Friendswood,Tx.

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Posts: 8689
From:Saco, Maine USA '72 Mustang Sprint 351C '94 F-150 XL 5.8L and a '97 Probe GTS 2.5L DOHC
Registered: May 99

posted 09-29-2000 03:41 PM               

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Soapy water won't make bubbles, the vacuum will suck it in.

Propane works best, the idle speed will increase as it is sucked in. Staring fluid works, but it's messy.

A good method to see if you have a vacuum leak at all is to put your hand over the choke plate and block the air. You should be able to stall the engine.
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SteveLaRiviere/Webmaster -- MCA # 47773

[This message has been edited by SteveLaRiviere (edited 09-29-2000).]

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Posts: 5491
From:Lyons, IL, USA
Registered: May 99

posted 09-29-2000 04:06 PM               

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Good old $.77 per can Wal Mart tech 2000 carb cleaner works great. Just spray it on the suspected area with the engine running and 'olla! The RPM should increase dramaticly. Alex

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Alex Denysenko Co-Administrator and Moderator
Fleet of FoMoCo's too long to list!
http://superstockers.homestead.com/week.html

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Posts: 462
From:Auburn, AL.. If you ever stop by check out my daily driver Maverick
Registered: Jan 2000

posted 10-03-2000 12:19 AM               

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quote:

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Originally posted by Nos351C:
spray carb cleaner around the area and if the idle picks up then drops back down you found one. The carb cleaner is supped to momentarily stop the leak.

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I agree, carb cleaner works very well, it doesn't stop the leak necessarily but the flammable liquid entering the intake will change RPMs, same concept for propane.

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-Charlie Ping
1970 Maverick Grabber
-1987 5.0L B303 roller cam/rockers
-1968 Mustang Toploader
-1977 Lincoln Versailles 9 inch w/discs
-1980 Granada Front Discs
www.MAVERICKGRABBER.com

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Posts: 8689
From:Saco, Maine USA '72 Mustang Sprint 351C '94 F-150 XL 5.8L and a '97 Probe GTS 2.5L DOHC
Registered: May 99

posted 10-03-2000 04:25 PM               

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Isn't the Tech 2000 kind of hard on the paint?

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SteveLaRiviere/Webmaster -- MCA # 47773

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Posts: 1125
From:Sonoma,CA,USA
Registered: Mar 2000

posted 10-06-2000 10:23 AM               

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SteveL,

If you have aluminum heads and intake the carb cleaner just cleans them up for you

SteveW

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Posts: 5491
From:Lyons, IL, USA
Registered: May 99

posted 10-06-2000 01:57 PM               

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Yeah, but Ward Cleaver was hard on the Beaver also. ! Alex

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Alex Denysenko Co-Administrator and Moderator
Fleet of FoMoCo's too long to list!
http://superstockers.homestead.com/week.html

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