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post #1 of (permalink) Old 01-22-2001, 11:41 AM
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4WD light off.. and no 4WD.

I may have messed up my 4WD. My light no longer comes on, and it doesn't feel like 4WD when I engage it, though my ratio does change. It used to 'complain' when I did tight circles in 4WD due to the slippage large/small circle problem. Now there's no complaining.

Here's what I've done since I last used 4WD.
1.) Installed a Weber carb and yanked tons of vacume lines. A couple I didn't understand on the passanger side near the pulse air and yanked them too (Didn't seem to affect anything). :P
2.) Temporarily removed the skid plate that supports the transfer case. I was originially trying to drain my transfer case fluid and replace. I did't realize the skid plate supported the t-case. So it 'dropped' about 6 inches. I had to hydrolic-jack the t-case back into place and resecure the skid plate. Didn't think I disconnected anything...

Any thoughts?

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post #2 of (permalink) Old 01-22-2001, 11:48 AM
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Re: 4WD light off.. and no 4WD.

Two things. You may have yanked the vacuum line that activates you front axle connect. Also, when you dropped the t-case/trans, you may have had the wire that plugs into the t-case that activates the 4WD lite come undone.

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post #3 of (permalink) Old 01-22-2001, 01:53 PM
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Re: 4WD light off.. and no 4WD.

Remember those pesky vacuum lines by the Pulse Air that didn't seem to do anything? Guess what they do.

'88 Sahara, 4.2, auto.
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post #4 of (permalink) Old 01-22-2001, 03:12 PM
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Re: 4WD light off.. and no 4WD.

Ugghh! <sigh>
While I'm twisting in the wind, does someone have schematic on the 4WD wiriing and vacume lines?
Or is it in my Chiltons?


post #5 of (permalink) Old 01-22-2001, 03:56 PM
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Re: 4WD light off.. and no 4WD.

Good luck finding it in a repair manual... They seem to skip that part altogether for some reason. I drew up a "schematic" of sorts from my 88 wrangler w/a 258 for another guy a while ago. It hopefully will help you find what you disconnected that you weren't supposed to.


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post #6 of (permalink) Old 01-22-2001, 05:57 PM
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Re: 4WD light off.. and no 4WD.

I made this one http://matt88yj.tripod.ca/4x4_vacuum_diagram

post #7 of (permalink) Old 01-23-2001, 11:34 AM
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Re: 4WD light off.. and no 4WD.

Ahh! Problem solved. Sure enough it was a yanked vacuum hose. There are 2 'nipple' looking plugs on the passanger side sorta close to the distributor. One never had a hose attached, which baffeled me for the longest time.. and the other was attached to a hose vacuum. Ends up that the unattached one is SUPPOSED to be like that. I yanked the other because it didn't seem to be doing anything :P

I just reattached the vacuum supply and wham-o. Thanks for both of those schematics... they definitely helped!


(I was 'hosed' there for awhile...)

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