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Oil pressure all over the place

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Old Oct 7, 2016 | 09:42 PM
  #1  
RangerWeaver's Avatar
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From: Tarpon springs, FL
Year: 2001
Model: Cherokee
Engine: 4.0
Default Oil pressure all over the place

I went wheeling last Thursday and ended up going through a lot of mud. Afterwards when leaving the area I noticed that my oil pressure was much lower than normal. Its normally around 30 at idle and 40 under power but it was down to 15 at idle and 20 under power. And as I was driving I stopped to clean off my XJ and noticed at start up that the pressure was up to 50.

I got the oil changed and now it starts at 80 and a few minutes later it drops to 60 than down to 40 and settles back off at 20.

And when the pressure on the gauge drops to low when sitting for a while it takes a few cranks to actually start up.
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Old Oct 8, 2016 | 03:46 AM
  #2  
Radi's Avatar
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From: Wisconsin
Model: Cherokee
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Originally Posted by RangerWeaver
I got the oil changed and now it starts at 80 and a few minutes later it drops to 60 than down to 40 and settles back off at 20.
Pretty typical when the sending unit fails.
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Old Oct 8, 2016 | 07:24 AM
  #3  
J3ff3ry_J33pst3r's Avatar
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From: Music City
Year: 1994.5
Model: Cherokee
Engine: Inline 6 4.0 HO
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^X2


@Radi beat me to it ; I've had this happen multiple times and replaced sending unit and it goes bye bye
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Old Oct 8, 2016 | 07:31 AM
  #4  
XJRed96's Avatar
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From: Midwest
Year: 1998
Model: Cherokee (XJ)
Engine: 4.0L
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be sure to get an actual Mopar part, it will be more expensive but i've noticed, that with other sensors they do not tend to be accurate, or fail quite early.
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Old Oct 8, 2016 | 08:02 AM
  #5  
BlueRidgeMark's Avatar
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From: Lost in the wilds of Virginia
Year: 1998 Classic (I'll get it running soon....) and 02 Grand
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Engine: 4.0
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Yep. The thing is lying to you. Replace it.

Too bad we can't do the same with politicians so easily.
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Old Oct 8, 2016 | 04:55 PM
  #6  
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From: Tarpon springs, FL
Year: 2001
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Thanks guys. I had a feeling that was the problem but I didn't know and wanted another opinion.
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