I recently rebuilt the motor in my 82 Ful size xlt lariat bronco (302W). I may have not hooked up the vacuum hoses right when I put the motor back in the truck. After I first put the motor back in when i used the A/C or heater, the air would only come out through the floor vents. I figured it was a vacuum hose that was not hooked up right, so I hooked up one of the hoses that is located on the passenger side of the firewall int he enigne compartment. There is a plastic piece with three vacuum hoses. I have one of those directly connected to my intake manifold and the other two plugged. Where do these other two go? There is also a black ball mounted on the passenger side fender well with a vacuum hose sticking out of this and is currently not being used. My problem is that I do not know where these hoses go and if they are even used in a non-egr environment. Another problem is that when I have the A/C turned and I am at a complete stop, when I try to take off it feels like the motor is being flooded and takes off slowly until I hit about 1500 RPM, while this is going on my A/C switches vents and instead of coming out of the vents on the dash it comes out of the floor vents until the bronco is not under load i guess you could say. I have turned up the idle a little to compensate for the A/C but this doens't halp much and causes my motor to diesel or keep running after i turn the key off. Any suggestions?

Additional info, c6 auto-tranny, and I have replaced the stock 2-barrel carb with A/C compensator with a 4-barrel Edelbrock with no A/C compensator thingy.

 

The canister needs to be hooked up for the times when your engine is running low vacuum. I will look at my 82 Bronco in the morning and see what runs where. It also sounds like you have a vacuum leak. Make sure you have no open vacuum lines at this point and I will get back to you tommorrow. You should also have a vacuum diagram located on the top of the radiator support or under your hood. Bob

 

I looked at the vacuum diagram that you are talking about but it makes no sense probably because I do not have any egr stuff on my engine. The only things I have hooked up to vacuum are the VA on the distributor, brake booster, tranny, and the hose going to the plastic thing in the illustration. I hope that helps.

 

One goes to the canister on the fenderwell and the other goes to your modulator on your tranny, I think. There should be a Tee in the line to the canister with a small hose going through your firewall for A/C controls. The tee may be some sort of check valve. I can send you pics of my engine compartment if you can tell me how to send them.

 

The tee looking thing is a check valve. The small vacuum line that attaches to one side of it goes through the firewall to your A/C control. The other side of the check valve connects to the vacuum resevoir/canister/ball. All of your vacuum operated doors operate off of the vacuum supplied to your A/C control. The resevoir and check valve supply vacuum to the control when there is low engine vacuum.

 

You can send the pictures to veniz23@yahoo.com. I figured out one of the problems I was having. The problem of the engine bogging down when trying to take off from a complete stop while the A/C is running. My vacuum advance was hooked up to the wrong port on my carb. It was hooked up to the port that has no vacuum at idle instead of the correct port ,which has vacuum at idle. I will try to hook the reservoir the way you are talking about although i dont have a check valve. If you are correct then the third outlet on the plastic thing must only serve a purpose on EGR equipped engines, correct??? I think the pictures would help allot. Thanks for everything.

 

Forgot that they don't let you put e-mail addy's in here. Anyway my e-mail is my user name at yahoo.com Username= veniz23 at yahoo.com
Thanks.

 

The third port goes to your tranny. I`m gonna try and send the pics.

 

Ok, I got the pics. I tried to just hook up two hoses and plug the third. I hooked up the far right hose to the tranny which is also teed off to go to the manifold. The middle hose I have plugged. The far left hose I have hooked up to one of the black T's that you show in the picture , which connects the reservoir and the A/C control thing. It still switches vents to the floor when the engine is under load. In your pictures I see the far left one is hooked up the same way as I do. The middle hose in your picture looks like it goes to the tranny? and I can't tell where the line on the far right goes. Where does that one go? Thanks for the pictures.

 

The middle does go to the tranny and the end one is where you are getting your vacuum for the header. It should be manifold vacuum. I will go outside and see where it is connected. Will get back to you shortly.

 

There should be a fitting right below your EGR valve that feeds vacuum to your brakes and some other things. The end hose should connect there so you are getting manifold vacuum to the three outlet vacuum header. Are you sure you installed a check valve or just a tee?