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This is very important, could help somebody...
I was told at the shop yesterday (Storz garage) in Denver. To express HOW important it is that the rubber lines in your engine having to do with Air / vacuums MUST remain pliable. If your hoses are getting brittle, or hard, you really should replace them.
There are stories of 911's not being able to start or stay running. After MUCH diagnosing, it turns out just a crack in the underside of a vacuum line was the problem. My engine has JUST been pulled out and tranny replaced/rebuilt along with clutch, several oil lines, and vacuum lines, breather etc, pressure plate, seals, etc... while it was out they showed me all the lines, and explained that it is one of those things that can be very hard to diagnose. JUST an FYI for you all! keep the rubber soft!!! comments are welcome! |
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03-07-2007, 08:16 AM
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Does Pelican or someone sell a package deal of most likely to fail lines? That might be helpful to facilitate a wholesale changeout periodically and maybe keep cost down a little bit.
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Shane - 1984 928S |
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03-07-2007, 08:18 AM
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Join Date: Sep 2006
Location: Oakland
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I've been having some rough-running troubles with my '76 Targa and a friend suggests that a vaccuum leak might be the problem. Given that it's now 31 years old, with 112k, and with many (maybe too many) original pieces, I wouldn't be at all surprised if a brittle hose or three was the cause.
Now, my problem is I'm fairly new to DIY engine work and I'm having trouble finding out all of the lines that I need to check for leaks. Can anyone offer some guidance or suggest a diagramI could review to show me every possible source of leaks?
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1976 Porsche 911S Targa |
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03-07-2007, 09:52 AM
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Somatic Negative Optimist
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How to find vacuum leaks has been covered many times, do a search.
(Upper right search button)
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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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03-07-2007, 09:56 AM
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Location: Peoples Republic of Long Beach, NY
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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03-07-2007, 10:04 AM
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Join Date: Oct 2002
Location: Monument, Colorado
Posts: 266
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Here's another way to find a vacuum leak. The probe tip releases propane and if a leak is found, the propane causes the idle to increase. No affliation to the ebayer, just found it on a Google search. You can also get it from Amazon.
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Jeff 1981 911SC Coupe - SSI's + Dansk, MSD, AC delete, Heater Backdate, Euro ride height, polygraphite bushings, Rennshift 1998 F-150 4x4 - Snow Time 1998 Yamaha WR400 - Mountain Ride |
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03-07-2007, 12:26 PM
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A few obvious ones to check would be the rubber breather cover at the top. It gets cracked around where the breather hose attaches.
see this diagram, I am drawing a blank but on the top image at the very top is a ribbed rubber thing. a hose goes into it and it picks up oil and air and i guess reburns it. But it can crack and cause problems, so you can check that out. Also just feel the hoses and see if they feel pliable or are stiff. Mine were bad, cracked and petrified. One of them snapped at the shop as he was showing me how stiff it was. http://www.pelicanparts.com/911/911_Parts/1978-83/1-1.JPG
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1979 911 SC 1974 OEM 911 Exhaust and Muffler - Modified to a 2-out Fiberglas Goodies, 17" C4 Cup Wheels |
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03-07-2007, 02:01 PM
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1979 Porsche 911SC
ME 262 (SOLD)
Colibri
Gas Mizer
Mileage King
Dog Bus
