Hi, my name is Stan, and I'm a new user so forgive me if this is covered somewhere that I couldn't find. I just dropped a fresh motor in this 79 f150 4x4, 400 cid, c6 transmission. The vacuum lines on the old motor definitely were not right, according to what I can make of the underhood diagram. I have a Chiltons that shows the same diagram, among others, for that truck. But, although I've worked on cars for years and work at a place with journeymen mechanics, I know just enough about vacuum lines to get myself into trouble, and the guys at work haven't been any help either. What I need is some help with trying to decipher this diagram. A website with an easy to understand explanation of what I'm looking at, or something. A Ford shop manual on CD or downloadable. Something that can tell me what VDV, VDRV,TVS, etc., are and what they look like. What are the letters BV, E, S, etc. on the diagram at the carb mean. The diagram shows what some of this stuff sort of looks like, and the "front of the engine", but I NEED HELP.

 

do you have a mitchell tune-up manual for the truck at your shop? cuz they have pretty good diagrams in them if no let me know and i can copy a pic for you and email it or fax it.

 

Watch your e-mail

Is there a white sticker on the front of the passenger side valve cover?

I need the codes on the right hand side of the sticker.

Rear Axle ratio,49 states or california ?

 

Hi, no I don't have a Mitchell manual, I've heard of them, probably at my library. If you have a picture or two that you could email that would be great. Stan

 

Hey Stan, All depends where you are. I have a 400 in my 79, here in canada.All I have for vacuum lines are one to the trans and one to the booster off manifold, and one ported to the dist. All that other crap is just that.

 

Hi, no sticker on passenger side valve cover. There was one on the driver's side. Was. I painted the valve covers. I don't know the rear axle ratio, although I could probably figure it out, I just got up this morning. 49 state or California? I dunno for sure, although it seems pretty fully loaded with anti-smog crap. It has an air pump, carbon cannister, etc. One thing stands out in my vacuum diagram that the others in the book don't have. My motor has 2 ported vacuum switchs, one with 4 ports and one with 2 ports.

EDIT:
I've got local emissions testing that I have to worry about. I have to make this thing pass a sniff test on a dyno.

EDIT #2:
Question about emissions tests. Could I add catalytic convertors and get rid of most of this vacuum crap and get away with it at the sniff test.


Stan

 

The rear axle code is on the Rating plate near the door latch.

Calif or 49 ?
I assume this truck was not sent to California?

I'm sitting here waiting for important info.

I need this info to give you a diagram.

Depending on your rear axle code, this should be close.

https://www.ford-trucks.com/user_gal...=16965&width=0

 

Try to find a "Milage Maker" and trash the rest of the vacuum lines and air pump except your air inlet (unless you are not running stock air cleaner) The milage maker is a finealy metered valve which introduces a small amount of vacuum to to the surface area of the float chamber. It stops excess fuel from "spilling" into the carb and will usually bring your emmisions up to air care standards

 

Consider yourself lucky, I have to pass a sniffer and a visual.
Hopefully I will find all the parts I need for the visual. Not an easy task.

 

Dunno if the vacuum for the 400 is the same as the 460. Here is a link to a thread on this forum that helped me a ton.

https://www.ford-trucks.com/forums/8...-needed-2.html




Nvm, just realized this thread is 11 years old.