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Old 07-05-2013, 09:40 AM   #1
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Oil pressure issue

97 TJ, 4.0L with 188k miles
On a recent trip to Grand Junction, I towed the TJ behind the motorhome, when we got to GJ, it was crazy hot, 104+ degrees. First day, drove the jeep ~15 miles no issue, 2nd, cranked up the jeep, check guages light on and reading zero oil pressure. Check the oil level, all good.
I was ~800 miles past the 3k mark for a change.
Started up again, the check light went off, but the oil pressure only got up to 25lbs, never got to the normal 40.
We bailed on our trip, the combination of the heat and the issue with the jeep, towed it back home and changed the oil and filter.
Now, sometimes I get normal oil pressure readings, sometimes ~30lbs, sometimes the check guages light on for a moment, then it pops up to near normal.
I am thinking that the erractic behavior could be the sending unit, thoughts?

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Old 07-05-2013, 09:54 AM   #2
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I'd remove the oil pressure sending unit then verify your oil pressure with a manual gauge if the readings are good check the oil pressure connector terminals and wires if they check good replace the oil pressure sending unit. Also if you see oil in the connector clean it out.
4.0 oil pressure spec is 10psi warm at 800rpm.

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Old 07-05-2013, 10:07 AM   #3
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I would just replace the oil pressure sender with one from the dealer. Senders from the parts stores like Autozone are known for problems like not working correctly.
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Old 07-05-2013, 10:40 AM   #4
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FYI...
I have a '97 and the oil pressure is almost constantly 0 to 1/4 (rarely at 1/2).
I checked the oil, when I first noticed, and there was plenty (maybe just a bit low, but nothing major).
I just got my oil changed, last week, and it still shows dangerously low pressure.
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Old 07-05-2013, 11:47 AM   #5
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Quote:
Originally Posted by btadlock View Post
97 TJ, 4.0L with 188k miles
On a recent trip to Grand Junction, I towed the TJ behind the motorhome, when we got to GJ, it was crazy hot, 104+ degrees. First day, drove the jeep ~15 miles no issue, 2nd, cranked up the jeep, check guages light on and reading zero oil pressure. Check the oil level, all good.
I was ~800 miles past the 3k mark for a change.
Started up again, the check light went off, but the oil pressure only got up to 25lbs, never got to the normal 40.
We bailed on our trip, the combination of the heat and the issue with the jeep, towed it back home and changed the oil and filter.
Now, sometimes I get normal oil pressure readings, sometimes ~30lbs, sometimes the check guages light on for a moment, then it pops up to near normal.
I am thinking that the erractic behavior could be the sending unit, thoughts?
Cut a trip/vacation short due to the Jeep you tow behind your motor home was showing low pressure? Wow! Spoiled much?

Sorry just busting your chops. I would still finish my trip and just suffer through it in the motor home. Hah hah.

I've been driving my Jeep for two years with the low to zero oil pressure and check gauges light popping on during stops with no problem. I would never let it interrupt a vacation, especially if was being pulled behind a motor home.
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Old 07-06-2013, 12:34 PM   #6
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my boss worked for chrysler..and our preinspector also..they both say that the cam bearings go out..causing it to not hold oil preasure..chrysler even has a tool to remove them and replace them in the block whith motor still in place..this is on th 4.0..
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Old 07-09-2013, 01:38 PM   #7
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Quote:
Originally Posted by kshaws21 View Post
Cut a trip/vacation short due to the Jeep you tow behind your motor home was showing low pressure? Wow! Spoiled much?

Sorry just busting your chops. I would still finish my trip and just suffer through it in the motor home. Hah hah.

I've been driving my Jeep for two years with the low to zero oil pressure and check gauges light popping on during stops with no problem. I would never let it interrupt a vacation, especially if was being pulled behind a motor home.
Hmm, lets see, I had a jeep that presented issues, no idea of the possible damage or what would have happen if continued to drive it, staying at an RV park with no attractions, in an industrial area of Grand Juntion, no transportation outside of the jeep, and we left on Sat night instead of Sunday morning, cutting short a trip only 4 hours from the house, spoiled?
Yeah, I live in Colorado, so I am spoiled, no need to hang out and be bored, stopped at 10k feet for the night, a bit cooler.

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