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1982 911SC Vacuum

Hello to all members. I am new to the forum and a first time Porsche owner.

I recently bought a 1982 911SC and the car idles high around 1400 rpm. Reading up on this forum I tried to find vacuum leaks. I removed the boot from the throttle body and used a glove to seal it. I tried to pressurize the system through the vacuum hose from the WUR. However, the system does not hold any pressure what so ever. It seems like there is a huge opening behind the engine/throttle body that is open. What am I missing here? Appreciate any inputs.

Old 05-28-2018, 06:30 AM
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Did you plug the exhaust?
Old 05-28-2018, 07:07 AM
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Quote:
Originally Posted by gazzerr View Post
Did you plug the exhaust?
Yes used a glove to plug the exhaust too.
Old 05-28-2018, 07:08 AM
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Vacuum test........

Quote:
Originally Posted by bluelectron View Post
Hello to all members. I am new to the forum and a first time Porsche owner.

I recently bought a 1982 911SC and the car idles high around 1400 rpm. Reading up on this forum I tried to find vacuum leaks. I removed the boot from the throttle body and used a glove to seal it. I tried to pressurize the system through the vacuum hose from the WUR. However, the system does not hold any pressure what so ever. It seems like there is a huge opening behind the engine/throttle body that is open. What am I missing here? Appreciate any inputs.


Blue,

Did you plug the two (2) vacuum hoses attached to the throttle body rubber boot? Pictures will be helpful. Keep us posted. Thanks.

Tony
Old 05-28-2018, 07:36 AM
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I have attached pictures.
Old 05-28-2018, 08:38 AM
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If I can see your pic correctly, that hose (green oval) basically goes to open air.

Given your car is running, did you try spraying around with your favorite volatile to check for leaks ?
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Old 05-28-2018, 09:01 AM
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The green oval is vacuum hose out the WUR. I connected it to my compressor reservoir.
Old 05-28-2018, 09:56 AM
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Originally Posted by bluelectron View Post
The green oval is vacuum hose out the WUR. I connected it to my compressor reservoir.
Red arrow

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Old 05-28-2018, 10:05 AM
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If you have a leak, wet your hand with water and reach around the back and your hand will get cool if air is escaping.
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1981 911SC Targa
Old 05-28-2018, 10:09 AM
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Red arrow

Oh Great Googly Moogly.

Good eye. We have a bingo.

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Last edited by Bob Kontak; 05-28-2018 at 10:13 AM..
Old 05-28-2018, 10:10 AM
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The picture is not clear. See attached and follow the green line.
Old 05-28-2018, 10:21 AM
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First thing I would do is put my JB Weld skills in play. A little dremel action too, on a piece of heavy plastic. Get the 24 hour JB Weld.

Then test again.
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Old 05-28-2018, 10:24 AM
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Oh Great Googly Moogly.

Good eye. We have a bingo.
Bad eye.

Darn optical illusion.
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Old 05-28-2018, 10:24 AM
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Quote:
Originally Posted by bluelectron View Post
The picture is not clear. See attached and follow the green line.
Your airbox is blown out from what the picture shows. Right about where a pop off valve would mount.

Third slat over from left. Is it intact or is it open to air?
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Old 05-28-2018, 10:26 AM
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Are these plugged ?

(Not mine)
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Old 05-28-2018, 10:44 AM
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Quote:
Originally Posted by Bob Kontak View Post
Your airbox is blown out from what the picture shows. Right about where a pop off valve would mount.

Third slat over from left. Is it intact or is it open to air?
The airbox looks intact. No cracks or bowing. It's a little dusty and that might have created another optical illusion.
Old 05-28-2018, 10:49 AM
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The airbox looks intact. No cracks or bowing. It's a little dusty and that might have created another optical illusion.
OK. What we were seeing would have jumped out at you with being there. Also, no way in hell your car would have ran even badly.
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Old 05-28-2018, 11:12 AM
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Are these plugged ?

(Not mine)
Do you mean plug the blue oval and the red on the left.
Old 05-28-2018, 11:23 AM
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Quote:
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Do you mean plug the blue oval and the red on the left.
Plug both.

The throttle body ports are normally not open but check them anyway. A hose could have fallen off.
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Old 05-28-2018, 11:28 AM
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I can see the engineers who designed the car laughing at me, trying to use a mirror to see what hoses are to be plugged and what have come off. Wish they design a service window behind the rear seat. Time to buy a selfie stick to stick my phone back there to see what’s going on.

Old 05-28-2018, 11:34 AM
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