Modified Vacuum line diagram for the 258

[cross-x]

(temporary problem)
Tried to load the image but didn't work. My internet provider had to write up a trouble ticket for me that they say will take up to 3 days so I can't load the image for the above link yet until they are done.

[IowaEagle]

If the image is not too large you can e-mail it to me. jpg or gif is OK.

[krazyk59]

in this diagram the line off the charcoal canister that says "to F/T" means to fuel tank correct? does it actualy go back to the fuel tank?? The one on my carb just has maybe a foot of vac hose on it and hangs down attatching to nothing?

[IowaEagle]

Is this the diagram you are using?  And, yes, it goes back to the tank thru the rollover valve.

[krazyk59]

Is this the diagram you are using?  And, yes, it goes back to the tank thru the rollover valve.

I guess that means I need to find the line that this empty hose runs to if it is indeed suposed to go back to the gas tank from the Charcoal canister

[Obscurity]

Does anybody happen to know what the differences would be for an '81? My guess is that it would just be the vac line for 4x4 is unnecessary since I've got the NP 119, would I be right?
I'm still contemplating whether it would be necessary for me to do this since the car is idling very smoothly all things considered, though I do know for sure that my vac lines aren't in that configuration (or any other logical configuration that I can see).....

[IowaEagle]

I believe the charcoal canister setup would be the same regardless of 4 WD configuration.  My 2WD Concord has the same setup.

[g-man]

OK, we have all asked about it but finally, here it is for everyone to see.  I spent more than a couple of days working this one out.  All of the emissions equipment is gone .  All that remains are the essential systems.

Brake Booster
EGR valve
Sole-vac
Distributor advance
4x4 vacuum
PCV & Fuel cannister
Choke (on mine)

Also, I have the TVS & TAC Vac. motor in the air cleaner cove connected.  I hope this helps every one out there who may be in the same boat I was.  Also, I hope it helps those of you doing EXTENDED bench testing of their pollution / emissions equipment.  I have set my car up like this and I also test ran it and boy is it ever smooooooth now!  This worked for me, but I don't suggest you should go out blindly and start ripping out components.  Remember the old axiom..."If it ain't broke, DON'T fix it"!!!

Bird-o-Prey,

I know this is pretty old, but I just found it recently.
Could you please tell me how your driveability has been since you made these modifications?
Especially interested in Mileage and Acceleration. Any part load cylinder mis-firing at all?
I would love to do this to my Eagle. It's an '81 SX4, but it should be pretty similar to your set-up.
Thank you very much,

g-man

PS I'll take some before and after photos of my work.

[thereverendbill]

when I went to this setup the car became more responsive and drives a heck of a sight better, I also upgraded to the GM HEI distributor at the same time though

[1982AMCCONCORD]

Hey I am glad I found this too!

What are the differences with this and an 82 Concord?

I was told that I should do this because my vacuum lines are all wrong. My Concord runs bad. I want to do the Motorcraft carb swap and the TFI upgrade when I do this as well.

[85AmCfreak]

I have a question is this a 5 port Vacuum switch using only 3 ports? Are 2 of the ports spliced?

[Bird-o-Prey]

Yes, you can see a line drawn between the two ports.  I copied this from the manual.  There are several types of these vac switches.  After I stripped my vac system down, I ended up installing a 3 port switch, which I don't even use anymore except when I hook up my EGR for emmissions testing.

[85AmCfreak]

You took the words out of my mouth, I was just going to ask if we can use an 84' 3 port switch. How does the switch work anyway?

[Draekon]

The CTO switch is a coolant temp override switch.  It blocks all vacuum when then coolant is below a certain temperature, and then opens up once the coolant has warmed.  With the 5 port switch, the two ports are connected to the same hose in order to provide vacuum to both sets of ports.

[85AmCfreak]

So if I remove that switch I will loose coolant?