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Old 04-29-2013, 04:59 PM   #1
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Oil pressure issue

Driving home after work today I came to a complete stop at a red light and I heard a loud "beep". I looked down at the gauges and saw the red "Check gauges" light was lit up. The oil pressure gauge was at 0, I didn't hear any knocking or taping sounds. Light turns green and I let out the clutch and start moving, as the RPM's increased so did the OP. Now I'm crusing at 35-40mph and the OP gauge is at around 40. Come to another stop and again the sound goes off, "check gauges" lights up and OP is at 0. Since Im pretty close I decide to limp it home but again the OP gauge goes back up to 40. Just checked the oil dipstick and it's kind of low but not where I would think that it'd cause the gauge to bounce around as much.

No other gauges seem abnormal, no knocking or ticking sounds so what could it be?

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Old 04-29-2013, 05:02 PM   #2
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The oil pressure sending unit could be going bad. Mine did the exact opposite. It pegged high at idle and actually dropped down when the rpms increased

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Old 04-29-2013, 05:07 PM   #3
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Hold the odometer reset and turn the key to the on position. All of the gauges and lights will go through a self check. You will be able to check to see if the oil pressure needle is sticking
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Old 04-29-2013, 05:28 PM   #4
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Hold the odometer reset and turn the key to the on position. All of the gauges and lights will go through a self check. You will be able to check to see if the oil pressure needle is sticking
Went out and did this and all the gauges including the OP moved. Now it didn't go all RR way to 80 but it did make it to about 60. After I started it and watched the gauge, at idle I was at about 15-17 then slowly crept down to 10-13 Drove it around the block and it was at near 40.
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Old 04-29-2013, 06:11 PM   #5
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I would look into a new sending unit. Its right beside the oil filter on my 2000 4.0. I picked one up from Napa about 4 years ago and its need fine ever since. If I remember correctly, it was less than $30
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Old 04-29-2013, 07:30 PM   #6
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Mine was doing the exact same thing. I changed the sending unit and it's worked fine ever since. Not expensive at all - oil, filter, and sending unit together was exactly 100 bucks at Auto Zone.
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Old 04-29-2013, 07:39 PM   #7
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Mine does the samething. I need to change the sending unit but I check and change my oil religiously so I know the gauge is full of it when it does it lol.
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Old 04-29-2013, 08:34 PM   #8
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Thanks for he input guys.
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Old 05-23-2013, 09:38 AM   #9
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Anyone got a part # for the sending unit? I found one at autozone but it's $45.99
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Old 05-23-2013, 10:18 AM   #10
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Anyone got a part # for the sending unit? I found one at autozone but it's $45.99
I had the sending units fail on mine and my son's TJs. In both cases I purchased and installed an after market mechanical gauge. They are cheaper and more reliable. On my son's we put a dab of silicone under the needle of the factory gauge at 50psi to avoid the "dead" look.
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Old 05-23-2013, 11:59 AM   #11
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Anyone got a part # for the sending unit? I found one at autozone but it's $45.99
Spend your money at the dealer for a OEM, I will only buy electrical parts from the dealer. Auto part stores sell a lot of Chinese crap.
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Old 05-23-2013, 01:12 PM   #12
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Absolutely spend the extra money at the dealer and buy OEM. Went hrough 3 Autozone units before I got smart and went to my dealer. Has been working correctly ever since.
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Old 05-24-2013, 11:27 AM   #13
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More oil pressure problems

"red "Check gauges" light was lit up. The oil pressure gauge was at 0"

1997 Jeep is new to me with 130,000 miles. Runs great except for the oil pressure dropping to 0 at idle after warm-up to operating temp. Dip stick shows the engine has oil to the "safe" mark. Replaced the oil pressure unit (with factory unit) but the problems continues. I did the instrument test and all gauges and lights work correctly.

Someone suggested changing the oil to 30 weight given the high mileage but that didn't stop the problem. Another suggested dropping the oil pan and cleaning the screen. Have not done that yet. Any other ideas/suggestions would be appreciated.

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