A Cars forum. AutoBanter

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » AutoBanter forum » Auto makers » Jeep
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

1990 wrangler 4 wheel drive vacuum line?



 
 
Thread Tools Display Modes
  #1  
Old September 11th 06, 02:55 AM posted to rec.autos.makers.jeep+willys
Jeremy[_2_]
external usenet poster
 
Posts: 14
Default 1990 wrangler 4 wheel drive vacuum line?

I have a 1990 Jeep Wrangler who's vacuum lines have been disconnected.
I need help sorting them out as to what goes where. I think I have most
of them connected properly but my 4 wheel drive light is on, but when
you ramp up the rpms it goes out. I just need some help getting the
lines in their proper places so the Wrangler idles rather than
stalling.

Thanks for the help
Jeremy

Ads
  #2  
Old September 11th 06, 03:36 AM posted to rec.autos.makers.jeep+willys
RoyJ
external usenet poster
 
Posts: 388
Default 1990 wrangler 4 wheel drive vacuum line?

To fix the stalling, there is a black plastic line that goes from the
driver's side of the engine down to the vac switch on the driver's side
of the transfer case. Find the line and plug it, that should get your
engine running correctly. If not, keep working on the vac lines.

To check out the vac operated axle disconnect, hook up the vac line to
the transfer case switch. With the engine running, CAREFULLY pull the
connector to the front axle off the vac motor. The green line should
have a slight vac with the transfer case in 2wd, the yellow line should
have vac in 4wd. If it doesn't switch back and forth, replace the vac
switch on the transfer case, $25 from the dealer. If no vac on either,
you have a bad vac line somewhere.

Your symptoms sound like a cracked vac line or trashed rubber connector
for the line to the switch or vac motor. Pretty common for that vintage
Jeep.

Jeremy wrote:
> I have a 1990 Jeep Wrangler who's vacuum lines have been disconnected.
> I need help sorting them out as to what goes where. I think I have most
> of them connected properly but my 4 wheel drive light is on, but when
> you ramp up the rpms it goes out. I just need some help getting the
> lines in their proper places so the Wrangler idles rather than
> stalling.
>
> Thanks for the help
> Jeremy
>

  #3  
Old September 11th 06, 02:40 PM posted to rec.autos.makers.jeep+willys
Mike Romain
external usenet poster
 
Posts: 3,758
Default 1990 wrangler 4 wheel drive vacuum line?

What engine?

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Jeremy wrote:
>
> I have a 1990 Jeep Wrangler who's vacuum lines have been disconnected.
> I need help sorting them out as to what goes where. I think I have most
> of them connected properly but my 4 wheel drive light is on, but when
> you ramp up the rpms it goes out. I just need some help getting the
> lines in their proper places so the Wrangler idles rather than
> stalling.
>
> Thanks for the help
> Jeremy

  #4  
Old September 11th 06, 03:36 PM posted to rec.autos.makers.jeep+willys
Steve Foley[_1_]
external usenet poster
 
Posts: 15
Default 1990 wrangler 4 wheel drive vacuum line?

"Jeremy" > wrote in message
oups.com...
> I have a 1990 Jeep Wrangler who's vacuum lines have been disconnected.
> I need help sorting them out as to what goes where. I think I have most
> of them connected properly but my 4 wheel drive light is on, but when
> you ramp up the rpms it goes out. I just need some help getting the
> lines in their proper places so the Wrangler idles rather than
> stalling.
>
> Thanks for the help
> Jeremy
>


I've got an 87 YJ with a 258 that I did that to once. If I recall, I
accidentally switched 2 vacuum lines 'somewhere near the distributor cap'.

Sorry I don't recall clearer.


  #5  
Old September 11th 06, 07:38 PM posted to rec.autos.makers.jeep+willys
Jeremy[_2_]
external usenet poster
 
Posts: 14
Default 1990 wrangler 4 wheel drive vacuum line?


Jeremy wrote:
> I have a 1990 Jeep Wrangler who's vacuum lines have been disconnected.
> I need help sorting them out as to what goes where. I think I have most
> of them connected properly but my 4 wheel drive light is on, but when
> you ramp up the rpms it goes out. I just need some help getting the
> lines in their proper places so the Wrangler idles rather than
> stalling.
>
> Thanks for the help
> Jeremy



Sorry I forgot to mention its a 6cyl. 4.2L. Automatic.

  #6  
Old September 11th 06, 08:16 PM posted to rec.autos.makers.jeep+willys
Mike Romain
external usenet poster
 
Posts: 3,758
Default 1990 wrangler 4 wheel drive vacuum line?

Jeremy wrote:
>
> Jeremy wrote:
> > I have a 1990 Jeep Wrangler who's vacuum lines have been disconnected.
> > I need help sorting them out as to what goes where. I think I have most
> > of them connected properly but my 4 wheel drive light is on, but when
> > you ramp up the rpms it goes out. I just need some help getting the
> > lines in their proper places so the Wrangler idles rather than
> > stalling.
> >
> > Thanks for the help
> > Jeremy

>
> Sorry I forgot to mention its a 6cyl. 4.2L. Automatic.


Here is a good site for most things to do with the 4.2.

http://home.sprynet.com/~dale02/list.htm

Is the emissions computer still in the loop? That can mean lots of the
vacuum line stuff is not needed.

The bad idle can be unrelated to the vacuum lines. That carb is
notorious for getting plugged up idle tubes. Here is a site on the test
for this and the fix:
http://www.off-road.com/jeep/tech/engine/carter.html

If you have oil blowing into the air filter, that can be another reason
for bad idle with an easy fix.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)
  #7  
Old September 14th 06, 05:52 PM posted to rec.autos.makers.jeep+willys
Jeremy[_2_]
external usenet poster
 
Posts: 14
Default 1990 wrangler 4 wheel drive vacuum line?

Thanks for the site. I looked up the vacuum lines and to the best of my
knowledge hooked them up. Only problem is my set up varies from that on
the site and Im not sure of I hooked up the lines correctly to the
carb. That is the only problem I am having know is the lines from/to
the car. IE the decel valve and I am pretty sure I do not have a pulse
air valve on the drives side. If anyone can help that would be awesome

Thanks Jeremy

  #8  
Old September 14th 06, 05:56 PM posted to rec.autos.makers.jeep+willys
Jeremy[_2_]
external usenet poster
 
Posts: 14
Default 1990 wrangler 4 wheel drive vacuum line?

Thanks for the site. I looked up the vacuum lines and to the best of my

knowledge hooked them up. Only problem is my set up varies from that on

the site and Im not sure of I hooked up the lines correctly to the
carb. That is the only problem I am having now is the lines from/to
the carb. IE the decel valve and I am pretty sure I do not have a pulse

air valve on the drives side. If anyone can help that would be awesome

Thanks Jeremy

  #9  
Old September 14th 06, 06:27 PM posted to rec.autos.makers.jeep+willys
Mike Romain
external usenet poster
 
Posts: 3,758
Default 1990 wrangler 4 wheel drive vacuum line?

If you don't have the decel valve or the pulse air system, no worries.
There are a ton of varieties of emissions components according to what
part of the world the Jeep was sold in.

Oh, both pulse air valves if you have them are on the passenger side.
That drawing is just a schematic, not a design.

If the decel valve is what I think it is, it is a factory defective part
that doesn't work. It was or another one was behind the carb and was
tied into the charcoal canister as well. The replacement is just a T or
straight fitting to have air flow.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Jeremy wrote:
>
> Thanks for the site. I looked up the vacuum lines and to the best of my
>
> knowledge hooked them up. Only problem is my set up varies from that on
>
> the site and Im not sure of I hooked up the lines correctly to the
> carb. That is the only problem I am having now is the lines from/to
> the carb. IE the decel valve and I am pretty sure I do not have a pulse
>
> air valve on the drives side. If anyone can help that would be awesome
>
> Thanks Jeremy

  #10  
Old September 14th 06, 07:21 PM posted to rec.autos.makers.jeep+willys
Mike Romain
external usenet poster
 
Posts: 3,758
Default 1990 wrangler 4 wheel drive vacuum line?

Oh, the straight fitting would be in the pulse air tube, you don't want
that sucking in the back side of the carb or it won't run for crap.

The purge from the canister should also just T into the PCV line behind
the carb with not valve in the way.

Mike

Mike Romain wrote:
>
> If you don't have the decel valve or the pulse air system, no worries.
> There are a ton of varieties of emissions components according to what
> part of the world the Jeep was sold in.
>
> Oh, both pulse air valves if you have them are on the passenger side.
> That drawing is just a schematic, not a design.
>
> If the decel valve is what I think it is, it is a factory defective part
> that doesn't work. It was or another one was behind the carb and was
> tied into the charcoal canister as well. The replacement is just a T or
> straight fitting to have air flow.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> (More Off Road album links at bottom of the view page)
>
> Jeremy wrote:
> >
> > Thanks for the site. I looked up the vacuum lines and to the best of my
> >
> > knowledge hooked them up. Only problem is my set up varies from that on
> >
> > the site and Im not sure of I hooked up the lines correctly to the
> > carb. That is the only problem I am having now is the lines from/to
> > the carb. IE the decel valve and I am pretty sure I do not have a pulse
> >
> > air valve on the drives side. If anyone can help that would be awesome
> >
> > Thanks Jeremy

 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
No Ported Vacuum steve Jeep 38 November 14th 05 02:58 PM
Distributor advances too much azazel scratch VW air cooled 12 August 5th 05 11:14 PM
62 Impala vacuum advance. homi Antique cars 7 July 28th 05 10:41 AM
Question Caravan all wheel drive shields Dodge 2 May 18th 04 01:30 AM


All times are GMT +1. The time now is 03:03 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 AutoBanter.
The comments are property of their posters.