Jeep XJ Random Tube
#1
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0L I6
Jeep XJ Random Tube
So I drive a 1990 Jeep XJ. Last week, it wasn’t starting/running and while trying to diagnose the issue I stumbled upon a mystery tubing piece. I was underneath the car, and on the right side of the transmission, I have a tube that’s not connected to anything down there. It’s the same material as the vacuum tubes in the engine bay. It seems to run up towards the motor around the area where the tranny fluid dipstick is, but I can’t pinpoint its origin. I finally got the car running and driving today, but it’s idling kind of rough. Could this be related to the tube? Does anyone know where it’s supposed to go? There’s another tube next to it that runs to the neutral safety switch
#3
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0L I6
It comes from up towards the engine bay
Runs alongside the tranny
And just isn’t connected to anything. The whole engine is very shaky and sounds like it’s glugging along when it’s running
#4
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Year: 1997
Model: Cherokee
Engine: 4.0L
Trace it back to the other end. Guesses are - axle, transfer case, or transmission.
BTW, i have never seen the exhaust tack welded directly to the crossmember like that before. Should be a rubber hanger in there so the exhaust can move a little.
BTW, i have never seen the exhaust tack welded directly to the crossmember like that before. Should be a rubber hanger in there so the exhaust can move a little.
#5
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0L I6
My buddy said it sounds like not all of my pistons are working, but I’m not sure how to diagnose or fix that
#6
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0L I6
I've tried to trace it to but I lose it around where the tranny fluid dipstick is
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#10
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Vent tube photos in this thread. https://www.cherokeeforum.com/f2/np2...filter-227368/
Vent has no vacuum, if that's what is not connected. Looks like a vent tube size wise.
Vent has no vacuum, if that's what is not connected. Looks like a vent tube size wise.
#11
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Roger that, exhaust should'nt be welded to something solid. And is not how my 90' hangs with factory setup. Looking for a cracked exhaust manifold which are pretty common with that design already.
#12
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0L I6
it was like that when I bought it I guess, but is that something that I need to unweld?
#13
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Year: 1997
Model: Cherokee
Engine: 4.0L
So, yes. Unweld it and buy the proper hanger.
#14
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0L I6
Yes. When you give the engine gas, it rocks side to side. When this happens, the exhaust rocks a little with it. This is part of the reason why exhaust is hung using rubber, to absorb the shock, as well as keep the vibrations down. Because the exhaust is welded solid, there is no movement. So, when the engine rocks side to side, the exhaust is being twisted more than it was designed to. The header on the 4.0L already has a reputation for cracking the collector as it is, even with a rubber hanger. That welded tab just speeds up the process. Something is going to give, and that weld looks solid, so my money is on the header cracking.
So, yes. Unweld it and buy the proper hanger.
So, yes. Unweld it and buy the proper hanger.