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Old 03-09-2012, 02:10 PM   #1
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Oil pressure drop during braking and idle

Replace oil pick tub, new pan gasket, sealed, no oil leaks, I have gone through 2 crap sending units, just put a mopar (from dealer ship) sending unit in. Still having same issue... 1997 wrangler 2.5L... Whats next? Please help thanks.

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Old 03-09-2012, 02:17 PM   #2
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what is it dropping down to?

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Old 03-09-2012, 02:22 PM   #3
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My bad, 0 psi
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Old 03-09-2012, 02:37 PM   #4
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go to an autozone store, grab a mechanical oil pressure gauge and watch it.. yours is computer controlled so this way you can figure out if its your gauge itself..

im assuming you arent experiencing any low end knocking in the engine or else you would've said so..
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Old 03-10-2012, 01:27 AM   #5
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I do not want to alarm you, but I had the same issue with my 2000 (4.0L). Oil pressure was fine when first starting the engine, but once warmed up it would drop to zero at an idle; when stopped at an intersection for instance. Temperature never exceeded normal operating range. I changed the sending unit, then the pump. I then searched online when those had no effect. I found no answer by doing this, but did find a lot of others putting tons of work and money into their Jeeps and not getting anywhere with the problem. I took my rig to a mechanic and had an external oil pressure gauge connected. They ran it and confirmed 0 oil pressure once warmed up. Now whenever you reved up the engine the pressure would jump up, then settled back at 0. Everytime it reached 0 pressure the check gauges light would come on.
After extensive searching for information and talking with people I concluded that the engine had simply started to wear out (oil pressure dropping as a result of it escaping into the spacing between components as the engine reaching normal operating temperature now caused tolerances to be exceeded). A rebuild by a mechanic would have cost me $1500 plus the cost of any worn out parts. For me a better solution was to wait until I found a low mileage engine of the same type for sale and buy it. The Jeep drove just fine like this. Of course that is not to say there was not a problem with it however as I understand they have driven fine for others with the same problem up until the engine blew up. Anyway, I drove my Jeep like this for more than a year before I was able to pick up a new engine, read up on how to install an engine, and found the time to do the swap. Engine never went out on me. I managed to find a used engine with low miles that I bought from a guy who wrecked his Jeep (same year, size motor) for $900. Cost of a few new tools and a couple days from work and no more oil pressure issue for me. I still have the old engine sitting on a stand in my garage. I plan to rebuild it myself as a learning project as I am only a novice when it comes to mechanical work, and if I can make it a good runner again I will find a use for it (ready-to-go backup ). My advice is to consider all your options before you start sinking a lot into your engine. Good luck.
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Old 03-12-2012, 09:47 AM   #6
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thanks everybody
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Old 03-12-2012, 09:57 AM   #7
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Quote:
Originally Posted by Coffeeman
I do not want to alarm you, but I had the same issue with my 2000 (4.0L). Oil pressure was fine when first starting the engine, but once warmed up it would drop to zero at an idle; when stopped at an intersection for instance. Temperature never exceeded normal operating range. I changed the sending unit, then the pump. I then searched online when those had no effect. I found no answer by doing this, but did find a lot of others putting tons of work and money into their Jeeps and not getting anywhere with the problem. I took my rig to a mechanic and had an external oil pressure gauge connected. They ran it and confirmed 0 oil pressure once warmed up. Now whenever you reved up the engine the pressure would jump up, then settled back at 0. Everytime it reached 0 pressure the check gauges light would come on.
After extensive searching for information and talking with people I concluded that the engine had simply started to wear out (oil pressure dropping as a result of it escaping into the spacing between components as the engine reaching normal operating temperature now caused tolerances to be exceeded). A rebuild by a mechanic would have cost me $1500 plus the cost of any worn out parts. For me a better solution was to wait until I found a low mileage engine of the same type for sale and buy it. The Jeep drove just fine like this. Of course that is not to say there was not a problem with it however as I understand they have driven fine for others with the same problem up until the engine blew up. Anyway, I drove my Jeep like this for more than a year before I was able to pick up a new engine, read up on how to install an engine, and found the time to do the swap. Engine never went out on me. I managed to find a used engine with low miles that I bought from a guy who wrecked his Jeep (same year, size motor) for $900. Cost of a few new tools and a couple days from work and no more oil pressure issue for me. I still have the old engine sitting on a stand in my garage. I plan to rebuild it myself as a learning project as I am only a novice when it comes to mechanical work, and if I can make it a good runner again I will find a use for it (ready-to-go backup ). My advice is to consider all your options before you start sinking a lot into your engine. Good luck.
How did you jump to total engine rebuild? Did you try changing the oil pump first?
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Old 03-12-2012, 10:48 AM   #8
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Quote:
Originally Posted by freeskier View Post
How did you jump to total engine rebuild? Did you try changing the oil pump first?

He said he changed the sending unit and the pump.
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Old 03-12-2012, 11:32 AM   #9
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Quote:
Originally Posted by tbensor

He said he changed the sending unit and the pump.
Woops, skipped over that...
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Old 03-12-2012, 11:50 AM   #10
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me too at first
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Old 04-18-2012, 07:04 PM   #11
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2000 Jeep Oil pressure


I am having the same problem and the sensor was replaced. I also just had all my lifters replaced costing $1500 because I had a bad lifter and had multiple engine cylinder misfires. Now my mechanic suggests an oil pump replacement for another $500. I had a 1990
Jeep Sport and the oil pump went at 170K miles. My 2000 now has 164K on it, so I'm concerned the same thing may happen now. I was hoping to get a few more months out of it versus getting a new replacement vehicle this fall. Does anyone suggest I roll the dice and not replace the pump?
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Old 04-18-2012, 07:23 PM   #12
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Changing the pump in mine had no effect, won't if it is internal engine wear that is causing the loss in pressure. I paid $900 for an engine... something to think about before you put a lot into the engine you have now. As far as replacing the vehicle, a 2000 is worth enough in most cases to justify a transplant.

Quote:
Originally Posted by RugPhD View Post
I am having the same problem and the sensor was replaced. I also just had all my lifters replaced costing $1500 because I had a bad lifter and had multiple engine cylinder misfires. Now my mechanic suggests an oil pump replacement for another $500. I had a 1990
Jeep Sport and the oil pump went at 170K miles. My 2000 now has 164K on it, so I'm concerned the same thing may happen now. I was hoping to get a few more months out of it versus getting a new replacement vehicle this fall. Does anyone suggest I roll the dice and not replace the pump?
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Old 05-08-2012, 03:38 PM   #13
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I finally had my oil changed from a 5w-30 oil to a 20w-50 oil and it solved my low idle gauge problem. The sending unit was replaced as well as all lifters in my 4.0. Since I have 165,000 on it, I am riding it into the sunset. Hopefully, some of you can try a heavy weight oil if you continue to have problems. One mechanic suggested a new oil pump, not going there for now.
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Old 07-12-2012, 09:49 PM   #14
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I just had the same problem. changed the oil on Friday and on Saturday the pressure started to plummet at every stop. Two sending units later I took a stab and changed the oil filter. Problem solved. I have never removed a filter with that little oil in it.

It seems this problem can come from lots of places.

Not buying fram again. I only got it because of the sale I am usually a bosch man.

If it helps the service manual says. (see pic)
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