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 |
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 > |
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 |
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. |
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. |
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) |
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 |
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 |
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 |
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 |
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