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Old 02-11-2012, 01:56 PM   #1
Join Date: Feb 2012
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Yj 4x4 trouble

Hello, I am new to the forum and am in need of some advice. My problem is the 4x4 won't engage on my jeep. I have a 93 wrangler with just over 38,000 original miles on it. This thing is practically like new! Anyway, I know the problem is with the vacuum to the actuator on the front axle. All the posts I have read tell you how to check for vacuum and if there is vacuum or isn't vacuum what is wrong. I have no vacuum to either line on the actuator and it doesn't matter if it's in 2 wheel or 4 wheel. No light on the dash, nothing. My question is this: where does the vacuum come from that goes to the transfer case. There are 4 lines coming off the transfer case, and only two go to the front end. I have looked at the diagrams on here and I just can't figure out where the other two lines are supposed to go. When I try to follow them on the jeep, they are in a loom/harness and I lose them. Any advice?

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Old 02-11-2012, 02:53 PM   #2
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Maybe this will help. If not do a little search.

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Old 02-11-2012, 05:50 PM   #3
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probably the vacuum switch on the t-case. should be one line comming from the intake manifold. 2 lines to the actuator. check vacuum at the switch.
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Old 02-11-2012, 10:32 PM   #4
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Old 02-12-2012, 12:23 PM   #5
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I agree with 2xs a posi lock works every time no more vacuum issues to worry about.
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Old 02-12-2012, 01:11 PM   #6
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I finally found the problem! I traced every vacuum line on the jeep! From the t-case to the actuator, to the manifold, to the vacuum reservoir, and back! Inside the loom, near the frame, there was a hole in the vacuum line. I replaced that line and shazaam!! I have 4 wheel drive! I also ordered the cable posi-lock yesterday. Should be here this week. I had already decided to go with the posi-lock, but I really wanted to play yesterday! Had a great afternoon jeepin' the dunes at Apex! Thanks for the input guys!
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Old 02-12-2012, 08:25 PM   #7
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My 93 used to go in sometimes and wouldnt go in other times. I was in a parking lot in a snowstorm thinking I was in 4x4, with the light on (which was not very often that my light indicator worked). Went over a speedbump and it popped out of 4 wheel and into bed bath and beyond foyer area I went!! Good thing the glass doors were open

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