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A good location to introduce the air is where the brake booster hose goes into the lower section of the air box.

The benefit of doing it that way is that it also takes the brake booster circuit out of the test. The booster circuit is also a somewhat common area for a vacuum leak and you can then test it separately from the engine.

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1977 911S Targa Chocolate Brown
Old 05-28-2018, 11:46 AM
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Quote:
Originally Posted by rwest View Post
A good location to introduce the air is where the brake booster hose goes into the lower section of the air box.

The benefit of doing it that way is that it also takes the brake booster circuit out of the test. The booster circuit is also a somewhat common area for a vacuum leak and you can then test it separately from the engine.
Is the brake booster the brass tube? Mine pulled out of the TB when I did not have it attached at the intake runners correctly. Engine will die. Suspect it can leak as well.

Or is it the port in the far right lower corner? Or the same? Been a while for me.

This is my 81 engine.

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Last edited by Bob Kontak; 05-28-2018 at 12:13 PM..
Old 05-28-2018, 12:11 PM
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How about the vapor filter attachment on the right side?

I lowered my motor to replace oil pressure sender on the back of the motor and cracked the plastic nipple on the carbon filter box which caused a vacuum leak.

ST
Old 05-28-2018, 12:27 PM
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The port on the WUR that you think is a vacuum line is actually not a vacuum on the -090 WUR. It is a vent. Learned that lesson when I was new too.

Use the brake booster hose.
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Old 05-28-2018, 12:39 PM
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Quote:
Originally Posted by Bob Kontak View Post
Is the brake booster the brass tube? Mine pulled out of the TB when I did not have it attached at the intake runners correctly. Engine will die. Suspect it can leak as well.

Or is it the port in the far right lower corner? Or the same? Been a while for me.

This is my 81 engine.

Is that the brake booster hose? If not, where is the brake booster hose. I thought the brake booster hose is supposed to run from the air box to the left of the engine bay.
Old 05-28-2018, 02:46 PM
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Originally Posted by bluelectron View Post
Is that the brake booster hose? If not, where is the brake booster hose. I thought the brake booster hose is supposed to run from the air box to the left of the engine bay.
My post asks the same question.

Left is lower right in the pic.
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Old 05-28-2018, 03:12 PM
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Excuse the lines, not bad after an IPA and a vodka cocktail, took two attempts though.

The brake booster ...
start here from TB


into AB (red arrow behind the other red arrow from the optical illusion)

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Last edited by pmax; 05-28-2018 at 03:46 PM..
Old 05-28-2018, 03:42 PM
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Quote:
Originally Posted by 1983Targa911 View Post
How about the vapor filter attachment on the right side?

I lowered my motor to replace oil pressure sender on the back of the motor and cracked the plastic nipple on the carbon filter box which caused a vacuum leak.

ST
Carbon canister vapors are pulled in way above the throttle plate. Before the air sensor plate. It cannot impact manifold vacuum and create false air.

You do not state what year your car is.

See picture below.

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Old 05-28-2018, 04:04 PM
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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.
I like this idea.
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Old 05-28-2018, 04:05 PM
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I like this idea.
Yeah, you like the reach around, don' t you ?
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Old 05-28-2018, 04:07 PM
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Yeah, you like the reach around, don' t you ?
Heh heh

I don't understand.

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Old 05-28-2018, 04:10 PM
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Heh heh

I don't understand.
Your buddy Raw should know.

Sorry, OP, blame the alcohol.
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Old 05-28-2018, 04:12 PM
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Your buddy Raw should know.

Sorry, OP, blame the alcohol.
LOL

He would only do that with his velcro gloves on.



OMG - we are becoming part of the problem.
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Old 05-28-2018, 04:33 PM
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. . .

OMG - we are becoming part of the problem.
I don't see any problems here!
Old 05-28-2018, 04:43 PM
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I don't see any problems here!
She's hot.
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Old 05-28-2018, 04:47 PM
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She's hot.
That nice fur coat speaks to me!
Old 05-28-2018, 04:55 PM
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OK. Back to our regularly scheduled program........
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Old 05-29-2018, 05:42 AM
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I still dont understand the brake booster routing but will leave that part for later. I will leave all the hoses in place and try to pressurize the system from top of the throttle body. Maybe even use smoke to determine what is going on. Have to travel for work this week but will provide an update the following weekend.
Old 05-29-2018, 09:51 AM
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Built a homemade smoke machine and tested the vacuum. Seems like all of my injectors are leaking vacuum. Did not find anything else. Plan on replacing the injector o-rings and the injector sleeves. While I am in there is there anything else I should take care of.

Smoke machine. Used smoke bombs from Grainger.


Glove on throttle body with a finger cut to accommodate air/smoke.


Leaking injectors


What other locations do I have to check for leaks?

On a side note, is it worth fixing the old CIS or just convert to Bitzracing EFI.

Old 06-03-2018, 06:27 PM
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