Need help troubleshooting Vac. tree

Stang_ROTY · 07-31-2001, 07:04 AM

Can anyone help me diagnose my problem with my vac. tree mounted on the firewall? I need someone to tell me how their setup is working and which vac. lines go to which letters on the tree. I found some black fluid (seems to be brake fluid, can't be oil) residing in my upper manifold plenum where the cover is removed. Ironically, I have my vac. inlet on the underside of the plenum so I figured something is (or was) backwards. Thanks

------------------
Finally DONE!!
93 GT, 393 stroker w/ Edlebrock Performer heads and EFI, 30lb injectors, Dynamic Roller Mite C4, 8 pt cage, Sothside Machine bars & Sub-frames, 3.73's, '69 351W block w/SCAT crank.

Brian88 · 07-31-2001, 07:57 AM

the S on the tree goes to the intake on the back side where there is one big and two small nipples. it goes to the big one. the brake booster gets connected to the other big nipple on the vacuum tree. the ac goes to accumulater. there are two other ones, i think they are s/c which i believe goes to cruise control and i don't know the other one.

Stang_ROTY · 07-31-2001, 11:14 AM

Thank you. I'm going to check that I have them correct after work. I still can't understand how that brake fluid or whatever it is got into my upper manifold.

RED92LX50 · 07-31-2001, 11:27 AM

Not to confuse matters, but...I put in a Vac gauge last weekend, and I connected it to the s/c port on the tree - as it was capped off and not being used. I have working cruise control, so I am not sure what that port was for. 92 LX 5.0 Convertible.

Stang_ROTY · 07-31-2001, 11:35 AM

SC-must be for speed control, right? Do you think that in any way possible the intake could suck fluid along with the air? I'm really bummed about this. How does that vac. tree actually work?

exgmguy · 07-31-2001, 02:30 PM

That tee is simply a place to tap into manifold vacuum. As long as the hoses fit ok, it does not matter which one goes where. (obviously you can't put the brake booster on the dinky one...)
If you are sure it is brake fluid, I would imagine your master cylinder could possibly be leaking into the brake booster somehow? Is your brake fluid low?

Stang_ROTY · 07-31-2001, 02:58 PM

exgmguy- I'll check that fluid level. If it is my Master Cyl. how do I replace it?

07-31-2001, 07:04 AM	#1
Stang_ROTY Registered Member Join Date: Feb 2001 Location: Berkshire County - Massachusetts Posts: 735	Need help troubleshooting Vac. tree Can anyone help me diagnose my problem with my vac. tree mounted on the firewall? I need someone to tell me how their setup is working and which vac. lines go to which letters on the tree. I found some black fluid (seems to be brake fluid, can't be oil) residing in my upper manifold plenum where the cover is removed. Ironically, I have my vac. inlet on the underside of the plenum so I figured something is (or was) backwards. Thanks ------------------ Finally DONE!! 93 GT, 393 stroker w/ Edlebrock Performer heads and EFI, 30lb injectors, Dynamic Roller Mite C4, 8 pt cage, Sothside Machine bars & Sub-frames, 3.73's, '69 351W block w/SCAT crank.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
The Tree Hugger	PKRWUD	Blue Oval Lounge	4	11-15-2002 02:41 AM
Cobra Intake vacuum tree	craig5.0	Windsor Power	4	08-26-2002 04:09 PM
Tree Time	vetteatr	Racer's Club House	12	02-07-2002 04:18 PM
What the f%^$!! Is it possible for the vac. tree to blow fluid into the plenum????	Stang_ROTY	Windsor Power	6	07-31-2001 03:02 PM
Vacuum tree on passenger side - Please help	2FastLX	Windsor Power	4	04-09-2001 06:38 PM

07-31-2001, 07:57 AM	#2
Brian88 Registered Member Join Date: May 2000 Location: Maryland Posts: 110	the S on the tree goes to the intake on the back side where there is one big and two small nipples. it goes to the big one. the brake booster gets connected to the other big nipple on the vacuum tree. the ac goes to accumulater. there are two other ones, i think they are s/c which i believe goes to cruise control and i don't know the other one.

07-31-2001, 11:14 AM	#3
Stang_ROTY Registered Member Join Date: Feb 2001 Location: Berkshire County - Massachusetts Posts: 735	Thank you. I'm going to check that I have them correct after work. I still can't understand how that brake fluid or whatever it is got into my upper manifold.

07-31-2001, 11:27 AM	#4
RED92LX50 Registered Member Join Date: Aug 1999 Location: Fairfax, VA Posts: 220	Not to confuse matters, but...I put in a Vac gauge last weekend, and I connected it to the s/c port on the tree - as it was capped off and not being used. I have working cruise control, so I am not sure what that port was for. 92 LX 5.0 Convertible.

07-31-2001, 11:35 AM	#5
Stang_ROTY Registered Member Join Date: Feb 2001 Location: Berkshire County - Massachusetts Posts: 735	SC-must be for speed control, right? Do you think that in any way possible the intake could suck fluid along with the air? I'm really bummed about this. How does that vac. tree actually work?

07-31-2001, 02:30 PM	#6
exgmguy Registered Member Join Date: Feb 1999 Location: Utica, Michigan Posts: 2,631	That tee is simply a place to tap into manifold vacuum. As long as the hoses fit ok, it does not matter which one goes where. (obviously you can't put the brake booster on the dinky one...) If you are sure it is brake fluid, I would imagine your master cylinder could possibly be leaking into the brake booster somehow? Is your brake fluid low?

07-31-2001, 02:58 PM	#7
Stang_ROTY Registered Member Join Date: Feb 2001 Location: Berkshire County - Massachusetts Posts: 735	exgmguy- I'll check that fluid level. If it is my Master Cyl. how do I replace it?