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Old 02-15-2013, 10:11 AM   #1
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4x4 always on

My 4x4 light is always on. i tested out if the 4 wheel drive works by putting the jeep up on a lift and engaged 4high and 4low and they worked fine. could it be a vacuum line?

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Old 02-15-2013, 01:53 PM   #2
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I don't have the pictures here at work but the vacuum operated switch is on the firewall. The vacuum line connects to it and you should see it on a bracket with two bolts almost in the center looking at the firewall just to the left of center. The switch if I remember is light blue in color on mine. See if it is still hooked up maybe the switc is stuck or gone bad finally.

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Old 02-15-2013, 02:47 PM   #3
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What year is your YJ? 87-90 is vacuum and 91-95 is electronic.
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Old 02-15-2013, 03:28 PM   #4
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Barbie is a 92 from the OPs profile so I guessed wrong always thinking everything is the same from my 89. So new info needed for the 92 4X4 light constant.
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Old 02-15-2013, 03:51 PM   #5
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It could be a stuck transfer case switch. When that happens, vacuum is always applied to the 4x4 light switch, so it stays lit even when you go into 2WD.

It's easy to check if you have a vacuum gauge. Look on the passenger side of the front axle and you should see a housing with 2 vacuum lines running to it. One one these will show a vacuum, one won't. As you shift between 2WD and 4WD which line has the vacuum changes. Disconnect one of them and hook it up to a vacuum gauge, and start the Jeep. If you see a constant reading as you go between 2WD and 4WD, then the transfer case switch is bad.

My 1994 did this, cost like $20 for the part at autozone. After I pulled my old one out I got the switch unstuck by hitting it with a hammer, but every few pushes it would get stuck again.
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