Mystery vacuum line (pics inside)

Mystery vacuum line (pics inside)

Joined: April 11th, 2008, 5:18 am

September 1st, 2008, 8:08 pm #1

I posted about a week ago with a question about a vacuum line of unknown purpose.

I just now traced where it comes from and am wondering where it's supposed to plug in. Here are two pics:

Here's where it comes out:


And heres where it comes from. Is this just a vacuum booster or what?


Any help is greatly appreciated.

-Jory

: 1982 Jetta Coupe : 1981 Scirocco S : 1986 Bertone X1/9 : 1984 GTI : 1980 Rabbit D : 1976 Scirocco : 1986 Jetta GLI : 1996 Jetta GLX VR6 : 1996 Jetta GL : 1973 Westfalia
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htf
Joined: May 5th, 2001, 4:29 pm

September 1st, 2008, 9:15 pm #2

of the first pic (cut off in the post) should be a connection to the intake manifold. This is where the vacuum is at. The "booster" is a vacuum reservoir for the AC.
You're welcome.


HaXD
Herzel, in Israel

WhiteX
The late Green '85 X1/9
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Jory
Jory

September 1st, 2008, 10:35 pm #3

My problem is, the the outlets on the end of the manifold are both occupied. One goes to the FPR and the other to the vacuum advance on the distributor. Is there another connection I'm missing?

The car has a misfire right now so an open vacuum outlet would explain it.

Thanks
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Joined: August 29th, 2005, 4:22 am

September 2nd, 2008, 1:57 am #4

The manifold hookups are for the charcoal canister purge on the left side and the fuel pressure regulator, with one tee-ing off to the vacuum reservoir on the right side.

The vacuum advance on the distributor hooks to a nipple on the bottom side of the throttle body, where the vacuum signal is ported by the throttle plate. If this nipple is unused and/or your vacuum advance is hooked up to manifold vacuum, it could explain your miss (lean condition and over-advance).

Gregory Smith

'87 Bertone X1/9 Corsa
'88 VW Vanagon
Olympia, Washington, USA
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Joined: April 11th, 2008, 5:18 am

September 2nd, 2008, 8:38 pm #5

Unfortunately, after correctly hooking the lines up, I still have my misfire
I'll make another thread for some advice on it.

: 1982 Jetta Coupe : 1981 Scirocco S : 1986 Bertone X1/9 : 1984 GTI : 1980 Rabbit D : 1976 Scirocco : 1986 Jetta GLI : 1996 Jetta GLX VR6 : 1996 Jetta GL : 1973 Westfalia
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