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Old 05-27-2012, 06:05 PM   #1
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Oil Pressure 6 cylinder

So I drove the Jeep yesterday for the first time in a week. Noticed the oil pressure reading 65-70 and then dropping back to the normal 40 where it has been since new in 2004. It was a quart low on oil. Topped it off and still is doing the same. No noise or anything else out of the ordinary. Wondering if the sending unit may be going out, it does have almost 175,000 miles on it now. Anyone have any ideas?

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Old 05-27-2012, 11:51 PM   #2
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Did it drop back to your normal reading after it reached operating temperature? Seems like a normal situation to me. Mine will have a higher reading when the oil is still cool and then drop back when it warms up.

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Old 05-28-2012, 01:39 AM   #3
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No it did not that is why I am hoping it is the sending unit. Need to find out how to test it.
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Old 05-28-2012, 07:30 AM   #4
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Sending unit would've been my first guess. Not a clue if there's a way to test it though.

My oil pressure has NEVER fluctuated in a 2001 TJ whether cold or hot, from 42psi.
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Old 05-28-2012, 08:38 AM   #5
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Maybe try changing the oil and filter first and see what happens. Sometimes oil filter anti drain valves can do strange things... Cheap and probally in your maintenence schedule anyway.....
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Old 05-28-2012, 02:12 PM   #6
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Anyone know where I could hook in a mechanical pressure gauge to verify the real pressure? I think I could screw one where the sending unit goes, but want to make sure it is the best spot.
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Old 05-28-2012, 02:19 PM   #7
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This is what I did to my 97 4.0
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