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Old 12-21-2010, 05:45 PM   #1
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98 wrangler high oil pressure

Hey I need some help, I've got a 98 wrangler 2.5 manual trans. My problem is that the oil pressure seems to be higher than normal recently. I recall it used to hang around 40-45 but now depending on rpms it'll range from 45 to almost 60 which seems higher then it should be and higher then it used to be. If anyone can help me figure out what the problem is if there is one I'd really appreciate it.

And I also have an odd high pitch kinda whistle sound almost coming from under hood in the vicinity of the alternator. It's not a belt, sound mechanical and kinda electric. Can't figure out what it is.

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Old 12-21-2010, 05:55 PM   #2
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Could be the cold weather

I notice mine is about 15 LBS higher this time of year.
That high pitch sound at the alternator could be the bearings in the alternator or it could be a battery being low causing the alternator to work harder. Check your amp gauge and see if it is higher than usual.
Hope that helps, others in here may have more info. Tom

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Old 12-22-2010, 03:17 AM   #3
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Thanks I appreciate your help. What you said about the bearings in the alternator sounds about right cause the battery amp meter is right where it's always been, right in the middle of the gauge at 14? I think. So why do you think your oil pressure is higher this time of year? And what is yours at now?
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Old 12-22-2010, 11:52 AM   #4
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It could also be your sending unit to your gauge. Mine goes from the low end of the gauge to the high end I asked my dad about it he said if it sounds normal your fine.
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Old 12-22-2010, 12:03 PM   #5
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As Buckstom said at the top of his post, the higher oil pressure can be caused by cold weather. Oil is thicker in cold weather so it takes more pressure to circulate it through the engine.

And your battery gauge is actually a volt meter, not an amp meter. 14 volts is a charging voltage which is fine.
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Old 12-22-2010, 04:28 PM   #6
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Thanks I appreciate the help. I don't really think the weather is having that much of an effect cause I live in so cal in long beach so it doesn't get that cold. Lol. I'm thinking it might be the sending unit. Hopefully it's a cheap problem to fix
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Old 12-23-2010, 11:04 PM   #7
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How about Oil Pressure of 80?

Noticed this after changing the oil and filter last weekend. Live in Northern Florida so it has been cold in the AM and warmer in the Afternoon. I paid attention this morning and the Oil Pressure was at 80 from Idle after the start until I got off the express way (about 20 miles). Once I slowed down to about 15mph then back up the pressure backed off to about 3/4 (60?). This afternoon same thing except stayed at 80 until I got off the x-way this time about 35 mile drive the pressure backed off to 3/4 and fluctuated as normal however still seems high.
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Old 12-24-2010, 12:04 AM   #8
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Quote:
Originally Posted by LRMark26 View Post
How about Oil Pressure of 80?

Noticed this after changing the oil and filter last weekend. Live in Northern Florida so it has been cold in the AM and warmer in the Afternoon. I paid attention this morning and the Oil Pressure was at 80 from Idle after the start until I got off the express way (about 20 miles). Once I slowed down to about 15mph then back up the pressure backed off to about 3/4 (60?). This afternoon same thing except stayed at 80 until I got off the x-way this time about 35 mile drive the pressure backed off to 3/4 and fluctuated as normal however still seems high.
mine never exceeded 50, the highest I saw at 0F running on 10W30 is about 45 PSI.
when cold at idle mine is about 40psi when fully warmed up its around 20 psi. at 2000rpm and above no matter warm or cold its around 40-45 psi.

this is what the manual says for both 4L and 2.5L
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Old 12-24-2010, 07:49 AM   #9
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this is what the manual says for both 4L and 2.5L[/QUOTE]


Thank you for providing that info, my computer crapped out that I had the service manual on, hopefully will be getting it back this weekend.

Anyone know what happens when running that high of oil pressure? Any thoughts on some problem solving?
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Old 12-24-2010, 09:29 AM   #10
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As to the whistling sound, find a piece of small hose or tubing, small enough that you can stick one end up close to your ear, and long enough to probe the area in question with the other end. This makes it very easy to pinpoint the source of any suspect noise.

Another method I learned from my grandfather is to use a piece of broomhandle to pinpoint ticking/knocking sounds from inside the engine. Put one end against your skull above one ear, and place the other then against a part of the engine to be tested. You can easily "hear" what's going on inside the block or valve cover this way, and accurately locate and isolate noises this way.

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