1991 f150 5.0 vacuum lines go where?
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Junior Member
Joined: Dec 2009
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1991 f150 5.0 vacuum lines go where?
I have a 1991 f150 1/2 ton 2wd 5.0L FI 8 cyl (XL Lariat).
Had issues with cold start up and rough idling....Asked many questions and got great advice from parts store persons, mechanics shops, etc...and did all that they advised.
Upon my most recent request for advice- was directed to check the vacuum lines,,,,,,as I was attempting this I found them to be more than brittle-as many of them cracked and fell apart even with a gentle hand. Now I have done the tedious job of replacing the entire lines/harness assembly, but am left with a few that I have no idea where they originally went.
Now, you would think that the Ford Garage would be able to provide a diagram from there archives- - - - But it SEEMS to be TOP SECRET!
OR maybe they are just too lazy/unmotivated to go check their archives!
You would think they would want to keep all the Fords they could on the road as a TESTAMENT to excellent vehicles!
I took it in to a local mechanic who really seems to "know his stuff" .....but he too is at a loss to where a couple go.
One of the biggest troubles is that you can't get your head back in their to see anything.
PLEASE ! ! ! ! Does anyone have a detailed diagram or schematic or what-have-ya to make this project a success?
From one Ford enthusiast to all you other Ford enthusiasts out there- you guys are literally my last hope! This is where I should've started to begin with is what my gut tells me!! Thank you for any help you can provide.
Had issues with cold start up and rough idling....Asked many questions and got great advice from parts store persons, mechanics shops, etc...and did all that they advised.
Upon my most recent request for advice- was directed to check the vacuum lines,,,,,,as I was attempting this I found them to be more than brittle-as many of them cracked and fell apart even with a gentle hand. Now I have done the tedious job of replacing the entire lines/harness assembly, but am left with a few that I have no idea where they originally went.
Now, you would think that the Ford Garage would be able to provide a diagram from there archives- - - - But it SEEMS to be TOP SECRET!
OR maybe they are just too lazy/unmotivated to go check their archives!
You would think they would want to keep all the Fords they could on the road as a TESTAMENT to excellent vehicles!
I took it in to a local mechanic who really seems to "know his stuff" .....but he too is at a loss to where a couple go.
One of the biggest troubles is that you can't get your head back in their to see anything.
PLEASE ! ! ! ! Does anyone have a detailed diagram or schematic or what-have-ya to make this project a success?
From one Ford enthusiast to all you other Ford enthusiasts out there- you guys are literally my last hope! This is where I should've started to begin with is what my gut tells me!! Thank you for any help you can provide.
Member
Joined: May 2005
Posts: 76
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From: Los Angeles, CA
Have you checked the color coded vacuum line diagram on the top of your air cleaner box? I know of no diagram in the '89 service manual or vacuum trouble shooting book.
Do you have a friend with an F150? Do you live in Los Angeles?
Do you have a friend with an F150? Do you live in Los Angeles?
Junior Member
Joined: Aug 2007
Posts: 5
Likes: 0
From: Connecticut
In that era, Ford published a separate book called "Electrical and Vacuum Troubleshooting Manual" each year as a companion to the shop books. These had the electrical and vacuum diagrams. You can generally find these on e-Bay from time to time. I believe there is a full set of 1991 F-series shop books including the "Electrical and Vacuum Troubleshooting Manual" on eBay presently.
Senior Member
Joined: Aug 2008
Posts: 338
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From: Long Beach, Ca.
Your 95' is MAP? That's a bummer. It doesn't look much like my 87's layout. I'm guessing the 91's something different from either.