• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-

Intake vacuum lines

  • Thread starter Thread starter cnorman31
  • Start date Start date Mar 9, 2025

cnorman31

New Member
Nov 16, 2014
27
1
3
Mar 9, 2025
#1
  • Mar 9, 2025
  • #1
I just did a smoke test on my '91 Fox and found that one of the vacuum ports on the back of the manifold doesn't have a hose connected to it. I believe it's supposed to go to the EGR solenoid since I currently don't have a hose hooked up to the EGR. However, the connector coming off the EGR solenoid is missing the piece where the hose inserts. I've tried finding this part online with no luck. Does anyone know if this piece is available for purchase, or can I just run a hose directly from the manifold to the solenoid and then to the EGR? Or can I just cap it off?


Also, I think a few of my other vacuum connections might be routed incorrectly. Every diagram I've seen shows that the large hose on the back of the manifold should go to the vacuum tree, but mine is currently running to the PCV valve and the S vacuum on tree is hooked up on the connection to the driver side of manifold. Does that matter? Here are some pics. It's a Trick flow intake BTW

Plug coming off egr solenoid
 

Attachments

  • 20250309_163553.webp
    662.9 KB · Views: 94
Last edited: Mar 9, 2025

89ripper

Founding Member
Jun 3, 2002
926
308
103
Rockford, Illinois
Mar 12, 2025
#2
  • Mar 12, 2025
  • #2
As far as vacuum go, it doesnt matter how its hooked up, vacuum is vacuum. The diagrams are helpful to check which components require it.

Im not entirely sure what that part is called that you are missing. Outside of a junkyard or maybe ebay im not sure where you could find one. There is a mustang junkyard out by me "encore mpw" but the site is down right now so I am not sure what is up with it.

You could go to any parts store and find an assortment of vacuum hoses, connections, and plugs to size up.
 
Reactions: Scrapla347

Willybill32

But at least it's tight!
5 Year Member
Jul 16, 2019
625
347
83
Lexington, KY
Mar 15, 2025
#3
  • Mar 15, 2025
  • #3
cnorman31 said:
I just did a smoke test on my '91 Fox and found that one of the vacuum ports on the back of the manifold doesn't have a hose connected to it. I believe it's supposed to go to the EGR solenoid since I currently don't have a hose hooked up to the EGR. However, the connector coming off the EGR solenoid is missing the piece where the hose inserts. I've tried finding this part online with no luck. Does anyone know if this piece is available for purchase, or can I just run a hose directly from the manifold to the solenoid and then to the EGR? Or can I just cap it off?


Also, I think a few of my other vacuum connections might be routed incorrectly. Every diagram I've seen shows that the large hose on the back of the manifold should go to the vacuum tree, but mine is currently running to the PCV valve and the S vacuum on tree is hooked up on the connection to the driver side of manifold. Does that matter? Here are some pics. It's a Trick flow intake BTW

Plug coming off egr solenoid
Click to expand...
For what it’s worth, here’s a photo with vacuum connections to a stock upper intake. You may want to search eBay for an EVTM (Electrical, Vacuum Troubleshooting Manual) for your year Mustang. Unless you did the modifications yourself, anything can be going on!

Bill
 

Attachments

  • IMG_20861.webp
    3.1 MB · Views: 165
Reactions: Scrapla347

Scrapla347

Active Member
Apr 23, 2020
200
67
38
Florida
Oct 15, 2025
#4
  • Oct 15, 2025
  • #4
LMR sells a vacuum repair kit that comes with some connectors and lines. I removed my emissions so I have that port capped off. Local parts stores also sell vacuum line, you might have to ask for windshield washer tubing.
 
You must log in or register to reply here.

Similar threads

D
Please help with vacuum lines
  • Dawgs000082
  • May 10, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
2
Views
76
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- May 10, 2026
Dawgs000082
D
D
Question about EGR valve, replacement, and a part on the valve.
  • DPP
  • May 9, 2026
  • SN95 V6 Mustang Tech
Replies
1
Views
68
SN95 V6 Mustang Tech May 23, 2026
DPP
D
G
Vacuum hose?
  • Gandalf79
  • Mar 5, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
10
Views
543
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Nov 18, 2025
mayapril
M
J
Emission problems
  • jls.zmmr
  • Feb 5, 2026
  • 1994 - 1995 Specific Tech
Replies
2
Views
208
1994 - 1995 Specific Tech Feb 7, 2026
AeroCoupe
H
Engine 1987 5.0 HO vacuum hose locations
  • harryhaber
  • Jun 20, 2025
  • Fox 5.0 Mustang Tech
Replies
2
Views
467
Fox 5.0 Mustang Tech Jun 21, 2025
limp
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?