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Old 04-07-2014, 09:45 PM   #1
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Question 1994 YJ 4WD Issues

Just recently bought a 1994, YJ. When I went down to the mud pit and tried to throw it in 4wd, the light never came on. While in the mud it seemed to struggle too, like the front end wasn't pulling or had any control. I tried to put it into lo also and nothing seemed to happen. I checked the actuator on the passenger side on the front axle and it seems to be clean and connected and the vacuum hoses don't seem to be disconnected or broken. What's the deal?

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Old 04-07-2014, 10:03 PM   #2
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Old 04-07-2014, 10:22 PM   #3
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check for vacuum on the lines at the axle actuator, if I remember right the vacuum will switch from one side to the other side when switched with the lever, if you hook a vacuum gauge to the lines when there is vacuum it should have 15inchs or so of vacuum, if this is happening check the actuator with a vacuum gauge it should hold 15 psi or so, if it doesn't hold vacuum than the actuator is bad, if its not switching the vacuum signal it is likely the 4x4 switch on the t-case is bad or the vacuum supply line to the switch is leaking....since your light didn't come on it basically means the lever in the actuator didn't move to turn on the switch that turns on the light..... if you have a switching vacuum signal at the front axle actuator and the axle actuator itself holds a vacuum then there would be an issue inside the axle like a broken collar or shift fork.....usually minor line leaks could cause it to try to engauge but 4x4 will may not work correctly like have issues with popping out of gear, basically what I am getting at there is use a vacuum gauge to eliminate doubt....a line with a slight leak in it will still feel like it has vacuum to your finger on the end of the hose so use a gauge, also make sure the engine is running when performing tests or don't expect to see any vacuum at all.....all this assuming you have the front axle actuator with a 2 wire electric connector to it and also a transfer case vacuum switch with 3 lines coming out of the top....sometimes I confuse the jeep models till I look at them and remember the system, pretty sure I got yours right....
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1994 , actuators , four wheel drive , jeep yj

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