Vacuum line. What for... (photo enclosed)

drudis · 04-01-2002, 11:32 AM

Here are 2 photos of vacuum lines.
1. The first one goes from intake to a "blocK" of 5 connectors (near #4 cylinder), leaving thru the RED vacuum line (to what?). And do I need it on an S-trim without emissions...?

#2. What goes to this firewall vacuum log? (I lost track when removing/installing intake...)

DRASTiK · 04-01-2002, 11:57 AM

well on my stang, and a few others I've seen, the B/R is just plugged off with no vacuum line on it at all. As far as the red one, I'll look next time I go out to my car, if no one has answered it before then.

Dark_5.0 · 04-01-2002, 12:15 PM

On mine B/R is also plugged off.

Wich vacuum line goes to the fuel pressure regulator....I dont know if I got the right line back on it or not.

Mach 1 · 04-01-2002, 12:22 PM

The first one (red one) goes to your control soleniods mounted aft of the passenger side strut tower brace. Off the top of my head and not looking it up, I believe these soleniods control vacuum to the EGR valve and the smog pump control valve.

The smog pump (air pump) control valve directs air pump air to eithier the heads or the cats.

Just leave it connected to minimise check engine lights, even if you dont have the smog pump installed, or the EGR valve.

I have my EGR valve blocked off internally at the manifold, but the vacuum line is still connected and i leave the red line that you mentioned hooked up as well. The other lines coming from that cluster (which it looks like you have already removed anyway) go to the smog pump. You should block off the open holes in the cluster with RTV to prevent vacuum leaks.

drudis · 04-01-2002, 12:29 PM

EXCELLENT, thanks.
I thought I once was told that I didnt need the red line, but wouldnt hurt to hook up that line anyways...
And the vacuum log, will be blocked off thanks.

ultraflo · 04-01-2002, 12:49 PM

I eliminated that vaccum junction and every imaginable piece of smog equip. some time ago. The only vaccum line I have run is from the intake to the f.p. regulator. No tree, no power brakes, removed the heater core and fan assembly from under the dash and all their vaccum lines...

About the check engine light, never had one until I disconnected the wiring harness from the EGR valve (experimenting to see what all I could eliminate before the dreaded light came on). I replaced it and still run the EGR spacer for that reason even though I actually do not have a functioning EGR system (it's an off road car, I swear

). Simplicity... I hated all of that clutter in the engine compartment (afterall that's were I spend most of my time it seems).

Just some food for thought...

stock89 · 04-01-2002, 10:00 PM

I am SOOOO glad I read this post. Just on Sunday I was changing my valve cover gaskets and noticed that 5 wire plug and one plastic line had snapped. It is a tan colored one that was short and reached immediately 5 inches forward and connected to a circular metal device. I have NO idea what any of those lines are for, so I rigged them together with electrical tape- Is there cause for concern? What is the circular metal thing? Thanks- you guys rock.

04-01-2002, 11:32 AM	#1
drudis Moderator Join Date: Dec 1999 Location: Livonia, MI, USA Posts: 1,194	Vacuum line. What for... (photo enclosed) Here are 2 photos of vacuum lines. 1. The first one goes from intake to a "blocK" of 5 connectors (near #4 cylinder), leaving thru the RED vacuum line (to what?). And do I need it on an S-trim without emissions...? #2. What goes to this firewall vacuum log? (I lost track when removing/installing intake...) __________________ Darius Rudis, Moderator Corner Carvers Delight 1989 Mustang LX - Open Track Car http://www.dariusrudis.com

04-01-2002, 12:15 PM	#3
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	On mine B/R is also plugged off. Wich vacuum line goes to the fuel pressure regulator....I dont know if I got the right line back on it or not. __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

04-01-2002, 12:29 PM	#5
drudis Moderator Join Date: Dec 1999 Location: Livonia, MI, USA Posts: 1,194	EXCELLENT, thanks. I thought I once was told that I didnt need the red line, but wouldnt hurt to hook up that line anyways... And the vacuum log, will be blocked off thanks. __________________ Darius Rudis, Moderator Corner Carvers Delight 1989 Mustang LX - Open Track Car http://www.dariusrudis.com

04-01-2002, 12:49 PM	#6
ultraflo NX dealer-man Join Date: Sep 1998 Location: Peoria, Illinois Posts: 977	I eliminated that vaccum junction and every imaginable piece of smog equip. some time ago. The only vaccum line I have run is from the intake to the f.p. regulator. No tree, no power brakes, removed the heater core and fan assembly from under the dash and all their vaccum lines... About the check engine light, never had one until I disconnected the wiring harness from the EGR valve (experimenting to see what all I could eliminate before the dreaded light came on). I replaced it and still run the EGR spacer for that reason even though I actually do not have a functioning EGR system (it's an off road car, I swear ). Simplicity... I hated all of that clutter in the engine compartment (afterall that's were I spend most of my time it seems). Just some food for thought... __________________ RLS Racing! 93 LX 9.20 @ 147mph 03 Mach 1 12.39 @ 116mph

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04-01-2002, 11:57 AM	#2
DRASTiK Registered Member Join Date: May 2001 Location: Yuma, AZ Posts: 536	well on my stang, and a few others I've seen, the B/R is just plugged off with no vacuum line on it at all. As far as the red one, I'll look next time I go out to my car, if no one has answered it before then. __________________ Dave 88 GT - 13.4@106 on street tires (2.2 60ft) My Stang RHC member #75 My stang is FOR SALE!!

04-01-2002, 12:22 PM	#4
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	The first one (red one) goes to your control soleniods mounted aft of the passenger side strut tower brace. Off the top of my head and not looking it up, I believe these soleniods control vacuum to the EGR valve and the smog pump control valve. The smog pump (air pump) control valve directs air pump air to eithier the heads or the cats. Just leave it connected to minimise check engine lights, even if you dont have the smog pump installed, or the EGR valve. I have my EGR valve blocked off internally at the manifold, but the vacuum line is still connected and i leave the red line that you mentioned hooked up as well. The other lines coming from that cluster (which it looks like you have already removed anyway) go to the smog pump. You should block off the open holes in the cluster with RTV to prevent vacuum leaks. __________________ 2002 GT 1993 GT (SOLD) '93 Mustang GT RHC member #142

04-01-2002, 10:00 PM	#7
stock89 Registered Member Join Date: Oct 2001 Location: Mannheim, Germany Posts: 124	I am SOOOO glad I read this post. Just on Sunday I was changing my valve cover gaskets and noticed that 5 wire plug and one plastic line had snapped. It is a tan colored one that was short and reached immediately 5 inches forward and connected to a circular metal device. I have NO idea what any of those lines are for, so I rigged them together with electrical tape- Is there cause for concern? What is the circular metal thing? Thanks- you guys rock.