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Old 09-07-2012, 07:02 PM   #1
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Too much oil pressure !!

Hey guys, I got a hell of a good question for all of you. It's not about my 67 though, I have a 99 wrangler 4litre 6 cyl. Sahara edition jeep. Pics on my profile. I noticed the oil pressure this week just sky rocketing all the way up. So, we test the pressure it's double what it should be. We change the oil pump, oil change.

Start the jeep up and still have pressure going up again. It settles at idle but as soon as I give it gas it goes up again instantly. And not just a little, if I start going faster it will go all the way to the end.

What in gods name is going on!!??!?!
I hope it's not something internal in the engine.

PLEASE HELP
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Old 09-07-2012, 07:08 PM   #2
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What psi does it get to
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Old 09-07-2012, 07:37 PM   #3
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It will go all the way to 45-50. When on idle it should be tinkering around 17psi.

---------- Post added at 08:37 PM ---------- Previous post was at 08:35 PM ----------

Now after we changed the pump, it idles the way it should but as soon as I give gaz it goes to about 35-45. On the freeway when I came home earlier it would go past that.
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Old 09-07-2012, 08:44 PM   #4
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I'm not a jeep specialist but I would think that's good. All oil pressure goes up with a little throttle. But 40psi sounds good for a regular oil pump. I've had high volume oil pumps peg out a 100psi gage till the motors warmed up and tinker around 80 ish
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Old 09-07-2012, 09:04 PM   #5
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Re: Too much oil pressure !!

As a rule you should have atleast 10 psi for every 1000 RPM's.
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Old 09-07-2012, 09:13 PM   #6
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I understand fluctuation and all...but when my gauge goes all the way to the end, I don't think that's normal. My gauge reads from to left to right 0---3---5.4 and it goes all the way to 5.4. So what explains that? I don't want engine failure.
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Old 09-07-2012, 09:21 PM   #7
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Stock gage could be one problem
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Old 09-07-2012, 09:26 PM   #8
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It can't be, we tested with a gauge at the engine. That's how we new the pressure was too high and eliminated the int. gauge as an issue.
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Old 09-07-2012, 09:43 PM   #9
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I know you said you tested of the engine with a gauge but did you go off the same sending unit?..the sending unit could be bad.
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Old 09-08-2012, 06:26 AM   #10
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We used the same input on the engine that the original gauge is attached to. Is there another way to test? Diff location?

---------- Post added at 07:26 AM ---------- Previous post was at 07:18 AM ----------

And by sending unit do u mean the oil pump? Cause that's been changed. Brand new from Chrysler.
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Old 09-08-2012, 07:36 AM   #11
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Quote:
Originally Posted by BigpapaDean
We used the same input on the engine that the original gauge is attached to. Is there another way to test? Diff location?

---------- Post added at 07:26 AM ---------- Previous post was at 07:18 AM ----------

And by sending unit do u mean the oil pump? Cause that's been changed. Brand new from Chrysler.
I don't really think there would be another location.
By sending unit I am assuming that your jeep has an electric oil pressure gauge. And the gauge receives a singnal from the sending unit (where you hook the wire up to off the block)
The only other option without just replacing the sending unit would be to run a mechanical gauge. With a mechanical gauge you would remove the sending unit and have a live oil feed to the mechanical gauge. A new sending unit I would guess is only around $20-30 ? So replacing it is probably your cheapest option. If of course that is the problem!
I don't want to say anything to cause someone to buy unneeded parts :/ But a bad sending unit would give an improper oil pressure reading.
The only other reason I could think of is a block in the oil passages causing the pressure to spike. Just like when high mileage cars loose oil pressure do to worn out mains the oil has less resistance so you see it as a drop in pressure.
But I would still suspect the sending unit IMO.
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Old 09-08-2012, 07:38 AM   #12
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Here's a pic of a sending unit for a 99 wrangler.
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Old 09-08-2012, 07:45 AM   #13
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Yup, that's what we did. Used a mechanical gauge where the original one goes to the block.
My guess is that there is some type of blockage, but where and could it be serious. $$$$$$
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Old 09-08-2012, 08:26 AM   #14
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Hmmm..if it is a blockage then where is the question. And a blockage could be bad as even though you're seeing a big spike in oil psi you would be starving the engine of proper oil flow. Oil psi is just the best way we can monitor oil flow which is more important then high pressure so to speak.
That's why they sell high volume (not high psi) oil pumps. when higher psi is needed sometimes they just supply a high pressure spring with the pump.
And in your case it seems your jeep has a lower standard oil psi rating then most of our stangs are used to.
You say 0 - 5.4 im guessing you're in canada?..
Anyways im not really sure how to find a blockage?..hmmm does it have an oil cooler? Maybe that's plugged up?..sorry I don't know much about jeeps:/
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Old 09-08-2012, 08:45 AM   #15
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It does have low psi rating, like I said on idle the specs say 17psi and on high rev around 35+ . It scares me to think that it might be bearings, cylinders....who knows. Maybe I buy a new wrangler!! Lol. A nice 4 door.
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Old 09-08-2012, 08:56 AM   #16
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Well no reason to give up just yet hopefully it's an easy fix that can be figured out..
im not a big fan of the 4 door wranglers myself. Well unless they get lifted a little with some aggressive tires then they sit pretty
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Old 09-08-2012, 09:05 AM   #17
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I don't see why 35+ is high. I think that is right where it should be. Like someone else stated, a general rule of thumb is 10 lbs of pressure per 1k rpm. So at 5000 rpm most vehicles will have 50 lbs of oil pressure.
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Old 09-08-2012, 09:18 AM   #18
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I know 35 in normal, but it goes up to. 45-50+ now. That's not normal for a jeep.

---------- Post added at 10:18 AM ---------- Previous post was at 10:17 AM ----------

....and as much as I've pushed my jeep it's never ever gone up that high. I've had it since 2004, I know that baby like the back of my hand.
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Old 09-08-2012, 09:21 AM   #19
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Quote:
Originally Posted by dreamstang
I don't see why 35+ is high. I think that is right where it should be. Like someone else stated, a general rule of thumb is 10 lbs of pressure per 1k rpm. So at 5000 rpm most vehicles will have 50 lbs of oil pressure.
That's what his manual says it should be..17psi @ idle and 35 freeway speeds..but he's seeing 35+ @ idle and the gauge will max out if he speeds up on the freeway..
Normally for our stangs id see no problem either. But I guess jeeps have different kahooter specs?.
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Old 09-08-2012, 09:23 AM   #20
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Gotcha.

If there was a blockage I would think there would be other bad side effects like ticking or knocking.

Maybe try a thin synthetic? Idk this is a wierd prob.
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Old 09-08-2012, 09:31 AM   #21
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Been there done that. I've been using castrol syntech for yrs now.

---------- Post added at 10:31 AM ---------- Previous post was at 10:30 AM ----------

It is a very weird prob, I've never see this in jeeps and neither has my mechanic. He's going to call my engine guy on Monday. He's the one that rebuild my 67 390. We see what he says.
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Old 09-08-2012, 09:34 AM   #22
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Well keep us posted, cause I'm very Interested. The only other thing that I could think of, if it was blocked maybe doing a flush with kerosene. But I don't know if that's ok to do with the motor fully together or not.
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Old 09-08-2012, 09:34 AM   #23
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Originally Posted by dreamstang
Gotcha.

If there was a blockage I would think there would be other bad side effects like ticking or knocking.

Maybe try a thin synthetic? Idk this is a wierd prob.
We ain't in kansas anymore buck!..
I don't really understand it either. I was just shootin some ideas of what could cause a high psi reading. And if it's not the sending unit then I'm not sure a blockage is the only other thing I can ponder.
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Old 09-08-2012, 09:39 AM   #24
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Quote:
Originally Posted by XXSTEVEO66

We ain't in kansas anymore buck!..
I don't really understand it either. I was just shootin some ideas of what could cause a high psi reading. And if it's not the sending unit then I'm not sure a blockage is the only other thing I can ponder.
Yeah me to. Dorthy
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Old 09-08-2012, 09:42 AM   #25
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Where's toto in all of this???
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Old 09-08-2012, 09:43 AM   #26
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If there's blockage maybe try seafoam to clear it out?
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Old 09-08-2012, 09:44 AM   #27
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Hey that's a good idea. But wait, we did do an oil change too. You think an additive like that would work?
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Old 09-08-2012, 09:54 AM   #28
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Its worth a shot
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Old 09-08-2012, 10:00 AM   #29
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Ok, I'll go out later and pick some up and see what happens.
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Old 09-08-2012, 10:35 AM   #30
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Re: Too much oil pressure !!

Found this on a jeep forum, Generally in 4.0 jeep engines it's never less than 30, with a high reading at driving rpm of about 40-60. Also it seems the sending units are known to go bad. Marvel mystery oil may help clear a blockage in the oil passages as well.
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Old 09-08-2012, 10:43 AM   #31
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Thanks cobra. I just logged in to another jeep forum, similar to our mustang one. Wait and see and they say. My mechanic actually check the specs. Question is do they differ from US and Canada models. like I said, he found that it should be at 17idle and then 35+ at higher speeds. I also checked prev threads on that jeep forum and some people have the same jeep as mine and there gauges show 0--30--40--50. Compared to mine that has 0--3--5.4. Who knows!!
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Old 09-08-2012, 11:19 AM   #32
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Re: Too much oil pressure !!

If those are the factory specs and it is going over the listed factory pressures, then likely the oil pump bypass is stuck shut from a broken spring or something.I really can't see how 50 psi is going to hurt anything though.
I wouldn't worry about it too much, it's when you don't have pressure that you should worry.
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Old 09-08-2012, 11:24 AM   #33
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Is the bypass part of the oil pump?

---------- Post added at 12:24 PM ---------- Previous post was at 12:22 PM ----------

And like I've said before the gauge is going bananas....all the way to max. That can't be good. And I'm sure too much pressure is not good long term, something is going to blow.
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Old 09-08-2012, 12:11 PM   #34
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Re: Too much oil pressure !!

Quote:
Originally Posted by BigpapaDean View Post
Is the bypass part of the oil pump?

---------- Post added at 12:24 PM ---------- Previous post was at 12:22 PM ----------

And like I've said before the gauge is going bananas....all the way to max. That can't be good. And I'm sure too much pressure is not good long term, something is going to blow.
On Fords it is and I assume on Jeeps it is similar.
Unless you are hitting 100 psi or more I wouldn't be to concerned.
If it's an electric gauge, then it could be something in the sender or gauge itself.
Even if you replaced the sender. I have seen them bad brand new from the manufacturer.


You did hook up a manual, direct pressure gauge right?
What was the max pressure you saw?
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Old 09-08-2012, 12:58 PM   #35
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Yes we did hook one up direct and it went up to 50psi. But for jeep standards it's high according to the specs.
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