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Old 12-11-2010, 04:22 PM   #1
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Oil pressure

99 TJ Wrangler 2.5 L
What is normal operating pressure for the oil gauge to say?

Idling it's at 50 then at higher speeds it goes to almost 80 is this normal? Or something wring??

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Old 12-11-2010, 06:03 PM   #2
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Sounds normal to me. When your engine is turning higher rpm's it generates more oil pressure.

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Old 12-11-2010, 06:07 PM   #3
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^ I agree.
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Old 12-11-2010, 06:39 PM   #4
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Mine does the same thing. I've been told by a mechanic that as long as you dont lose pressure or that it doesnt stay on 80, its fine.
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Old 12-11-2010, 08:46 PM   #5
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Ok good I was a little worried
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Old 12-11-2010, 10:11 PM   #6
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mine never hit higher than 50psi
when its cold it idles at 40psi, when its warmed up it idles at 20 psi.
when at 2000-3000rpm it goes up to 50 psi when cold and 40 psi when warmed up.
80 psi is obviously wrong and probably theres something blocking the oil passage.
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Old 12-11-2010, 10:19 PM   #7
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Don't know if your smaller engine is supposed to be higher than my 2001 4.0L, but mine has never even gone up to 50psi!

Mine is usually between 40 to 45 all the time, warm or cold, idling or nailing it!!
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Old 12-11-2010, 10:40 PM   #8
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Quote:
Originally Posted by cork1958 View Post
Don't know if your smaller engine is supposed to be higher than my 2001 4.0L, but mine has never even gone up to 50psi!

Mine is usually between 40 to 45 all the time, warm or cold, idling or nailing it!!
they are the same in the service manual
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Old 12-12-2010, 01:14 AM   #9
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Newer Wranglers, perhaps newer than 2001 or 2002 or so, don't give you the true ups and downs of oil pressure like earlier TJs do. Jeep reprogrammed the oil pressure gauge circuit so the oil pressure indicator doesn't rise and fall in step with engine rpms as it is supposed to which was unnecessarily alarming new Jeep purchasers who didn't realize it was supposed to do that. They were running to their Jeep dealerships complaining about their widely varying oil pressure that was scaring them, since few new Jeep owners have ever owned a vehicle before that had a true oil pressure gauge.
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Old 12-12-2010, 03:27 AM   #10
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Mine stays between 40- 50Psi..
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Old 12-12-2010, 12:36 PM   #11
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Quote:
Originally Posted by Jerry Bransford View Post
Newer Wranglers, perhaps newer than 2001 or 2002 or so, don't give you the true ups and downs of oil pressure like earlier TJs do. Jeep reprogrammed the oil pressure gauge circuit so the oil pressure indicator doesn't rise and fall in step with engine rpms as it is supposed to which was unnecessarily alarming new Jeep purchasers who didn't realize it was supposed to do that. They were running to their Jeep dealerships complaining about their widely varying oil pressure that was scaring them, since few new Jeep owners have ever owned a vehicle before that had a true oil pressure gauge.
lol. everybody should know that you turn a pump faster, you get more outta it.

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