Vacuum hose?

G

Gandalf79

Member

Jun 14, 2023

61

13

18

Mar 5, 2025

#1

• Mar 5, 2025

• #1

Looking to see where the other end of this hose should be connected
It is coming from what I believe is a vacuum port at the back of the upper intake
My ride has been very hesitant and bogging down at higher speeds to the point of almost stalling.
Is that a vacuum issue? Pcv issue, fuel pump or filter issue or all of the above.
Also , is this my pcv valve location on my 79?
Ty for any help !

 

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89ripper

Founding Member

Jun 3, 2002

926

308

103

Rockford, Illinois

Mar 5, 2025

#2

• Mar 5, 2025

• #2

Vacuum leaks can cause issues, sure. Might be helpful to get something like this

1979 Ford Mustang Capri Electrical Vacuum Troubleshooting Manual | eBay

Find many great new & used options and get the best deals for 1979 Ford Mustang Capri Electrical Vacuum Troubleshooting Manual at the best online prices at eBay! Free shipping for many products!

www.ebay.com

There are pdf versions as well, someone on here might have one

This is one example of vacuum routing, but its for an '82. Some stuff might have carried over

Fig. 77 Calib. Code 2-21E-R10 Federal, Exc. High Alt. — 1982 Ford Mustang V8-302 5.0L Service Manual | Operation CHARM

Detailed repair manual for the 1982 Ford Mustang V8-302 5.0L.

charm.li

 

Blackhawkxx

Advanced Member

Mar 3, 2023

453

451

73

Mar 6, 2025

#3

• Mar 6, 2025

• #3

Take your air cleaner off and look around, you should be able to find it.

 

85GTStangGuy

5 Year Member

May 19, 2021

997

625

113

Jax, Florida

Mar 6, 2025

#4

• Mar 6, 2025

• #4

89ripper said:

.... Might be helpful to get something like this

1979 Ford Mustang Capri Electrical Vacuum Troubleshooting Manual | eBay

Find many great new & used options and get the best deals for 1979 Ford Mustang Capri Electrical Vacuum Troubleshooting Manual at the best online prices at eBay! Free shipping for many products!

www.ebay.com

Click to expand...

@Gandalf79

Get this...it may well end up being the best $20 you spend on the car!

 

Reactions: General karthief and 89ripper

G

Gandalf79

Member

Jun 14, 2023

61

13

18

Mar 8, 2025

#5

• Mar 8, 2025

• #5

89ripper said:

Vacuum leaks can cause issues, sure. Might be helpful to get something like this
Thanks everyone

Click to expand...

I had ordered the manual so I’ll have to look closer to it

89ripper said:

1979 Ford Mustang Capri Electrical Vacuum Troubleshooting Manual | eBay

Find many great new & used options and get the best deals for 1979 Ford Mustang Capri Electrical Vacuum Troubleshooting Manual at the best online prices at eBay! Free shipping for many products!

www.ebay.com

There are pdf versions as well, someone on here might have one

This is one example of vacuum routing, but its for an '82. Some stuff might have carried over

Fig. 77 Calib. Code 2-21E-R10 Federal, Exc. High Alt. — 1982 Ford Mustang V8-302 5.0L Service Manual | Operation CHARM

Detailed repair manual for the 1982 Ford Mustang V8-302 5.0L.

charm.li

Click to expand...

 

S

sparkylawdog

Active Member

Aug 8, 2011

30

31

28

Delaware

Mar 8, 2025

#6

• Mar 8, 2025

• #6

As far as the PCV valve location, that's where it is on my 85 5.0

 

G

Gandalf79

Member

Jun 14, 2023

61

13

18

Mar 8, 2025

#7

• Mar 8, 2025

• #7

Thanks guys I’ll look into it. I do have the manual also

 

G

Gandalf79

Member

Jun 14, 2023

61

13

18

Mar 9, 2025

#8

• Mar 9, 2025

• #8

This is a better view of the vacuum port and the hose with no home

 

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AeroCoupe

lube between the nut and the face. I know my lubes

Founding Member

Oct 28, 2001

5,793

3,927

183

Claremore, OK

Mar 9, 2025

#9

• Mar 9, 2025

• #9

Looks like the one to the driver side also has a hose missing. I would just cap them and move on.

 

General karthief

wonder how much it would cost to ship you a pair

5 Year Member

Aug 25, 2016

27,838

10,511

203

polk county florida

Mar 9, 2025

#10

• Mar 9, 2025

• #10

Those are, I believe to be temperature switches for vacuum operated gizmos in the emissions stuff and/or carburetor (stock) function.
Depending on how much of the stock emissions/carb that's left, ignore them, there's no vacuum to them right?

 

Reactions: AeroCoupe

M

mayapril

New Member

Nov 16, 2025

1

0

1

UK

Nov 18, 2025

#11

• Nov 18, 2025

• #11

I’m actually looking for this manual in PDF. Thanks for the tip on where to find it. I also wanted to add that a couple of days ago I came across a foxit review on a platform that showcases the best online editors. I’d been looking for a good tool to work with PDFs for a long time, and thanks to the quality reviews and the AI chat on that platform, I finally made my choice. I think this might be useful for someone.

 

Last edited: Nov 28, 2025