Vacuum Diagram For "74 Bronco

[southmississippiEB]

My Vacuum Advance on my 302 has a constant vacuum pull on it. I know that it is missing 2 or 3 sensors, but I do not know which ones are actually beneficial to install. Does anyone have a diagram of the vacuum lines with the various sensors listed on it. I believe that I can get the motor to run like a sewing machine if I can regulate the vacuum going to the vacuum advance. Any help would be appreciated.

Thanks in advance..

 

[Bully Bob]

There should be a vac. port on your carb.....where do you have the tube attached now..?

Below the carb would be 100% vac...

 

[southmississippiEB]

There should be a vac. port on your carb.....where do you have the tube attached now..?Below the carb would be 100% vac...

The vac advance goes in at the port on the rear passenger side of the carb. There are 3 ports on the rear driver side of the carb that are plugged off. I assume there were some misc. emission sensors that once belonged there.

Thanks for any help you can provide

 

[Bully Bob]

Do you know what carb it is..?

& sorry ., I left out.....there should be a vac. port that is Dizzy advance specific.

 

[southmississippiEB]

Do you know what carb it is..?
& sorry ., I left out.....there should be a vac. port that is Dizzy advance specific.

It is a motorcraft model 2150 ........2bbl. I rebuilt the carb a couple of weeks ago and reinstalled everything the same way that the previous owner had it.

 

[Bully Bob]

The vac. port (for dizzy) on my 302 2brl. carb. is on the pass. side....just to the right of the auto choke...,

& about 1" behind & slightly above the bolt hole @ bolting down the carb.

With the throttle plates closed (choke off) the port is fed by a tiny square hole in the throat.

This hole is slightly above the throttle plate at idle.

HTH

B

 

[oleguy74]

you need a timmed port.no vacume at idle.