Removing Pulse Air and Sol Vac circuits?

Removing Pulse Air and Sol Vac circuits?

99jpxj

Jeeper
Posts
24
Thanks
0
Location
N. GA
Vehicle(s)
1986 CJ-7 Laredo
w/ 258, auto, D300, D30, AMC20
I have a '86 CJ7 I as seen in this post that I have gotten running and somewhat drivable. I am working towards getting it running solidly while maintaining minimal investment. So far I'm in it about 3.5 hours and $0. I am having issues with it idling up in park and bogging down/stalling under sudden load. After doing a bit of reading, my eventual plan is to do the "Nutter" process and a new carb to eliminate finicky/worn out/overly complex junk currently in place. In the meantime however, I'd like to see what I can do to eliminate obvious problems and try to get it running better with the factory equipment if at all possible.

With the backstory out of the way my question involves the removal of the Pulse Air Tube system and Sol Vac system from the Jeep. The pulse tubes were all rotted out so I figured there was no point in keeping that whole system in place, so I pulled them out and removed the small vacuum lines from the valves to the two solenoids. The third solenoid in the set was connected to the Sol Vac on the carb, which was also rotted out and non functional, so at that point I pulled the Sol Vac, it's vacuum line, as well as the 3 solenoids since they all seemed to feed from one Tee along the firewall.

Now that the Pulse Tubes, Sol Vac, and associated solenoids are gone and associated electrical connectors left unplugged, I am wondering if I can simply leave it this way and let the computer still control the carb mix and ignition timing for the time being, or will it freak out with the other 2 components missing and not work at all? I'd rather hold off on the "Nutter" for a bit as I don't have a timing light yet and would like to read up a bit more first, or will it be required with what I have already done?

I must also give a huge thanks to the "Adventures Under the Hood" site, very useful information there!


Thanks!
 
With all those parts out of the loop I would just do the bypass with your stock carb. There has to be some one that lives close to you that can loan you a timing gun or time it for you.

At the least make sure any open vacuum lines are plugged. Also check with stores like advanced.. they do loan tools out.
 
That's what i was wondering, will the computer still perform its other 2 jobs with these 2 missing? I'm used to newer stuff that would complain, but didn't know how "smart" the CJ computer is and whether not having the solenoids plugged in would affect the other circuits. I guess a wiring diagram would help to answer that, off to do some more searching.

The vacuum system has been modified as follows:

85jeepvacmodded_zps211a9551.webp

All red components were removed and the 2 holes in the bottom of the air cleaner capped so there are no "new" leaks. Keep in mind mine is an auto so I do not have the Decel valve to deal with. I still have to run through the rest of the system, but provided everything is good there, will this allow the computer to still control the carb and ignition timing in a factory manner?
 
Normally its a all or nothing thing to remove the emissions, comp and carb at one shot. I would guess that with out the sensors your speaking of the comp would try to adjust for them being missing or use bad info and screw up your timing and mixture. Your 80% done with the nutter bypass by removing all the comp :dung:. just finish it up.
 

Jeep-CJ Donation Drive

Help support Jeep-CJ.com by making a contribution.

Help support Jeep-CJ.com by making a contribution.
Goal
$200.00
Earned
$0.00
This donation drive ends in
2 weeks, 0 days, 2 hours, 16 minutes, 45 seconds
  0.0%
Back
Top Bottom