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Registered
Join Date: Jan 2001
Location: Iowa
Posts: 1,020
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Locating a vacuum leak
My Carrera is idling correctly for about 1 minute and then it drops below 800rpm. I recall some time ago reading on this BB that one way to locate a vacuum leak is to spray something on the hoses while the engine is running. Can anyone tell me what that was?
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John C 1988 911 Carrera coupe 2002 BMW 530 |
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08-29-2004, 10:20 AM
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19 years and 17k posts...
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Starting fluid is what I have used to find a vacuum leak.
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Art Zasadny 1974 Porsche 911 Targa "Helga" (Sold, back home in Germany) Learning the bass guitar Driving Ford company cars now... www.ford.com |
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08-29-2004, 12:24 PM
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Somatic Negative Optimist
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To really pinpoint the leak, you need to have a fine nozzle at the end of your devise. Just spraying widely, will not tell you the exact location of the leak. It could be hoses, intake gaskets, airbox, etc. Tighten all the clamps on the hoses, especially the breather hose both ends.
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1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD! 1995 seafoam-green 993 C2, LSD, Sport seats.  Abstract Darwin Ipso Facto: "Life is evolutionary random and has no meaning as evidenced by 7 Billion paranoid talking monkeys with super-inflated egos and matching vanity worshipping illusionary Gods and Saviors ". 
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08-29-2004, 01:51 PM
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Designer King
Join Date: Mar 2004
Location: Toronto, ON Canada
Posts: 5,499
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If you search you will find a lot of discussion on the use of propane.
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Paul Yellow 77 Sunroof Coupe/cork interior; 3.2L SS '80 engine/10.3:1/No O2; Carrera Tensioners; 11 Blade Fan; Turbo tie rods; Bilstein B6; 28 tube Cooler; SSI, Dansk; MSD/Blaster; 16x7" Fuchs/205/50 Firestone Firehawk Indy 500s; PCA/UCR, MID9 Never leave well enough alone |
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08-29-2004, 08:37 PM
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Registered
Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,514
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starter fluid is flammable big time. not a good idea!
carreras typically suck in a lower intake gasket, or the hose comes off the regulator at the RF corner of the engine, or a hose comes off the forward side of the throttle body. the intake gasket problem is usually diagnosed by finding a cylinder that is not working at idle. pull off the injector plug or a sparkplug connector and no change. good compression, gets fuel and spark, but doesn't work at idle.
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
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08-30-2004, 08:05 AM
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Registered
Join Date: Jan 2001
Location: Iowa
Posts: 1,020
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The hose came off the side of the oil filler pipe. When the engine lid is closed, the a/c condensor hose pushes down on the vacuum hose connected to the oil filler pipe, and if it is not clamped down tightly, it eventually gets pushed off the pipe connector lip. Removing the oil filler cap, to see if the idle dropped, it was easily visible.
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John C 1988 911 Carrera coupe 2002 BMW 530 |
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08-30-2004, 05:47 PM
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Somatic Negative Optimist
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Good for you. Now ged rid of the A/C, extra blower fan, and cruise control. Less weight and more room. Cheers.
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1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD! 1995 seafoam-green 993 C2, LSD, Sport seats. Abstract Darwin Ipso Facto: "Life is evolutionary random and has no meaning as evidenced by 7 Billion paranoid talking monkeys with super-inflated egos and matching vanity worshipping illusionary Gods and Saviors ".
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08-30-2004, 06:17 PM
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MazdaSpeed3
ME 262 (SOLD)
Colibri
Gas Mizer
Mileage King
Dog Bus
