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Alright....
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The car dies when the oil cap is removed...
New 3.2 owner here, had a 2.7. I took it around the block to warm up the engine and when I went to check the oil level, as soon as I remove the oil cap the car dies.
What am I doing wrong? I just did an engine swap so anything is possible.
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Stephen Friendswood, Texas '78 Targa w/ '86 930/20 w/ '74 915/06 |
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04-24-2007, 04:06 PM
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Vacuum pressure I think, the car does hunt a little at idle when mine is removed but it really shouldnt kill the car.
good luck!
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Matthew “Sometimes the questions are complicated and the answers are simple.” |
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04-24-2007, 04:07 PM
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Virginia Rocks!
Join Date: Oct 2003
Location: Just outside the beltway
Posts: 8,497
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It means you probably have a second vacuum leak. What's the idle like before you removed the cap? Mine is usually at 950, and when I removed the cap, dropped to 300.
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Rosewood 1983 911 SC Targa | Black 1990 944 S2 | White 1980 BMW R65 | Past: Crystal 1986 944 na Guards Red is for the Unoriginal
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04-24-2007, 04:09 PM
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Alright....
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The breather hose was cut when I got the car so I fabbed one up. I wonder if they have a check valve in them or something.
I figured that was it but had to ask. I guess I can just disconnect the hose and block it off when checking the oil.
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Stephen Friendswood, Texas '78 Targa w/ '86 930/20 w/ '74 915/06 |
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04-24-2007, 04:09 PM
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Alright....
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Idle is about 1k before I remove the cap. It is possible I missed some lines before I installed it. I do have a rough idle but I am running without the O2. Was told I could run without it and just have a rough idle.
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Stephen Friendswood, Texas '78 Targa w/ '86 930/20 w/ '74 915/06 |
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04-24-2007, 04:10 PM
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Registered
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Location: RI
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I think it has something to do with a restrictor that is supposed to go in the vent tube that attaches to the oil tank and the air box.
Taking off the oil cap is creating to much of a vacume leak. Just a guess.
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Silver 1980SC Euro coupe |
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04-24-2007, 04:14 PM
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SCWDP- Shock and Awe Dept
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Quote:
A piece of round aluminum stock that will fit in the hose w/ a 1/4 hole through the center should work fine.
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Ryan Williams, SCWDP '81 911SC Targa 3.6 '81 911SC Coupe 3.2 #811 '64 VW Camper Bus, lil' Blue |
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04-24-2007, 04:21 PM
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Alright....
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So on the 3.2's they only require a small line to vent the tank.
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Stephen Friendswood, Texas '78 Targa w/ '86 930/20 w/ '74 915/06 |
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04-24-2007, 04:31 PM
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Registered
Join Date: May 2005
Location: Cridersville, OH
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Also check the infamous vacuum port on the backside of the intake. Should be on #3 intake runner.
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75 911 Indian Red- RUFWAN2B 2000 Boxster 2000 & 2007 Dobies www.stahlwerks.com Cages and preparation for your Porsche “People who never make mistakes must get tired of doing nothing” Bill : The origin of the orgy of Porsche |
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04-24-2007, 04:35 PM
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SCWDP- Shock and Awe Dept
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Actually there is a restrictor in there on the 3.2, p/n 930 107 289 00.
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Ryan Williams, SCWDP '81 911SC Targa 3.6 '81 911SC Coupe 3.2 #811 '64 VW Camper Bus, lil' Blue |
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04-24-2007, 04:36 PM
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Registered
Join Date: Jul 2001
Location: Connecticut
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clamp the breather hose with a vice grip or pliers and then take the cap off. If it dies then you have a leak somewhere else. If it doesn't then you are missing the restrictor mentioned above.
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'83 SC |
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04-24-2007, 04:40 PM
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SCWDP- Shock and Awe Dept
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Great advice Chris.
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Ryan Williams, SCWDP '81 911SC Targa 3.6 '81 911SC Coupe 3.2 #811 '64 VW Camper Bus, lil' Blue |
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04-24-2007, 04:57 PM
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Alright....
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Yes! The simple approach worked. The car idles with the hose clamped. And yes, the car was low on oil!
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Stephen Friendswood, Texas '78 Targa w/ '86 930/20 w/ '74 915/06 |
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04-24-2007, 05:08 PM
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Alright....
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I went to Lowes and picked up a .75 cent copper 3/4" gas pipe cap. Drilled a 1/4 hole in it, then placed it in line and put a hose clamp on the outside. Works like a charm! I'll consider buying the $18 OEM part later when I want to upgrade......
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Stephen Friendswood, Texas '78 Targa w/ '86 930/20 w/ '74 915/06 |
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05-03-2007, 04:00 PM
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Registered abUser
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Quote:
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05-03-2007, 07:04 PM
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1979 Porsche 911 SC (ROW) Rebuilt 3.0
1981 Porsche 911SC Targa 3.6
1981 Porsche 911SC 3.0L
