Modified Vacuum line diagram for the 258

[Bird-o-Prey]

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"!!!

[mccastlej]

Thanks a bunch!  I am going to try to tackle this myself tomorrow, and now you've made it a whole lot easier for me to do!  I'm not sure if I'm going to hook up the tac vac motor though. 

[Bird-o-Prey]

It was there and it does perform a useful service if you live in a part of the worl where it can get cold out.  Especially in winter.

[mccastlej]

You have a good point there as I do live in Michigan.  I have two different things in the same area as the tac vac motor.  I'll guess I'll have to look a bit better, and see what the deal is?

[Bird-o-Prey]

Most of the vacuum diagrams in the TSM show 2(?) TAC Vac motors.  My air cleaner cover only had one, so that's how my diagram came out.  I expect it wouldn't be too hard to plumb in the other one shown in the TSM.  Just splice in the line where it looks appropriate and works best.

[IowaEagle]

One of mine is wired open.  Think it is the front one that restricts air intake when warming up?  Thanks a bunch for this Bird-O-Prey.  Now to remember to get it in the Eaglepedia too.

[trapperjack]

Great job. Wish this had been there when I started my "bench testing". I'm goigng to see how what I ended up with compares to this. Did you do ECM Test yet?
trapperjack

[Bird-o-Prey]

I still have some electrical issues to look into.  There is a little doo-hickey next to the TVS which is supposed to connect to the computer (and in my car, does not).  Also, I have some other wires that dont seem to be connected to anything.  However, the car does seem to run better, and I will be giving it a full tune up before I run it through the emissions test.

[IowaEagle]

Let us know what you get for readiings.  That should be interesting.

[hojorisin]

Of the Eagles I have that have two vac motors on snorkel :   the one closer to inside/air cleaner is to shut off air intake completely (it overrides the front / pre heat one) w/car off; this is to prevent run-on/dieseling; I also have wired one of these full open (bad motor) ; you should still use the heat one tho--great in winter

[Bird-o-Prey]

After much Futzing about with the lines untill 1 am, I managed to get the 4wd shift motors re-connected properly.  However, the road test was less than spectacular.  When I shift in & out of 4wd, I once again get the little wheeze from the switch that lets me know things are working.  I shifted in to 4x4 mode and the ride that had previously been choppy, had smoothed out (ditto for the ride in 2wd).  However...  During my test run, as I was slowing down to make a turn, I heard the most peculiar buzzing/grinding sound, and the beasty was back to shuddering and bouncing along again.  I still get the wheeze from behind the switch, but the car won't stay fully engaged in either driving mode!  The lesson here...if it ain't broke, don't fix it!!!  I just had to clean off the grease/oil/dirt/accumulated crud to make it all look better, didn't I?  I suspect that my cleaning has revealed a hitherto sealed leak in one (or both) of the vacuum shift motors.  Now where did I put that diagram for modifying my shift motors to be cable actuated...hmmm??

[ozzman104]

Well, I just got done redoing my vacuum lines using this diagram.  The mess of unnecessary lines I took out was amazing.  oh yeah...  and the wagon runs great now.... especially for a $300 that they were going to scrap because of a leaking fuel tank.

[IowaEagle]

GREAT!  Another satisfied AMC Eagle Nest Member.  Now I need to do the same.

[trapperjack]

Any updates, Bird-O-Prey? how's she running?

[mccastlej]

from what I could tell, the control solenoid for the Sol-Vac still needs to be connected, otherwise the sol-vac will be extended all the time?