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Old 11-24-2010, 08:55 PM   #1
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Oil Pressure Issues!!!

Hey everybody. I hope this doesn't seem to stupid... I have noticed that my wrangler oil pressure has been running a little higher than normal. The needle on the gauge usually sits dead middle on the gauge and sometimes fluctuates to the dot just right of the middle. However over the past couple of days the needle has been riding farther to the right than it usually does... I checked the oil and the level is fine. I also regularly change the oil so I have no idea why the oil pressure is higher than normal... Am I making an issue out of nothing or is this a problem? Any help would be great! Thanks.

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Old 11-24-2010, 09:03 PM   #2
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There was a thread about this last month.... I'll try to find it

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Old 11-24-2010, 09:23 PM   #3
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Could be any number of things...
Oil sending unit crapping out.
Colder, thicker oil will give higher pressures

Oh yea, hanging out in Olde Town Petersburg will do it too especially on Thursday nights.
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Old 11-24-2010, 09:27 PM   #4
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hanging out in olde town petersburg will do it too especially on thursday nights.
wtf?
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Old 11-24-2010, 09:34 PM   #5
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wtf?
Sorry they have several bars down there and live music on thursday nights...that usually raises my oil pressure.
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Old 11-24-2010, 10:50 PM   #6
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cold temperature, but even that Ive never seen higher than 50psi.
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Old 11-24-2010, 11:36 PM   #7
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Quote:
Originally Posted by Fweaky View Post
Could be any number of things...
Oil sending unit crapping out.
Colder, thicker oil will give higher pressures

Oh yea, hanging out in Olde Town Petersburg will do it too especially on Thursday nights.
Very true
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Old 11-24-2010, 11:39 PM   #8
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Thanks for the posts. I am going to try to find the old post about this to see if I can gleen any additional information. The temp here is getting cooler but I have had my Jeep through a few seasons now and the cooler temp. hasn't made it do this before.
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Old 11-24-2010, 11:50 PM   #9
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Its most likely the sending unit.
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Old 11-25-2010, 11:11 AM   #10
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my 2000 TJ did the same. idles around 40, changed the sender....no go, so it is running fine and I just deal with the gage I posted a thread but didnt get a real answer, guess there was an Xbox tourny going on that day...LOL:rofl :
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Old 11-25-2010, 12:10 PM   #11
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I'd have to say colder temps.
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Old 11-25-2010, 12:14 PM   #12
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What model year TJ do you have? Older and newer TJ oil pressure gauges work differently. But Jeepjones probably has the answer, colder temps are probably the reason since colder oil has a heavier viscosity and is harder to pump which increases the oil pressure. Though once the engine and oil gets up to temp it should go back to normal.
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Old 11-25-2010, 12:35 PM   #13
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the newer oil pressure gauge doesnt move around alot as the older one
my 97 when warmed up idles at 10-15psi, at 2000rpm its about 40psi
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Old 11-25-2010, 06:46 PM   #14
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Mine sets sometimes at 60 sometimes higher....I'm guessing sending unit, But as long as it runs great with no knocks,pings, or any noise then I'm not worrying about it. after all they are known to be unreliable right?
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Old 11-26-2010, 01:51 PM   #15
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My 99 Sahara was shooting up to 80 psi at 2000 rpm when the temps got below freezing. This was running my 5w-30 "winter oil". As soon as it warmed up it would go back to normal but I was worried about blowing out seals or my oil filter at that pressure.

I ended up giving it a new oil pump because I got a service info thing from the dealer that said....

"The pump incorporates a nonadjustable pressure relief valve to limit maximum pressure to 517 kPa (75 psi). In the relief position, the valve permits oil to bypass through a passage in the pump body to the inlet side of the pump."

Apparently these valves stick but you don't notice until it gets pretty cold and the oil gets thick and the pressure shoots up.

Now my oil pressure at operating temp is 20 psi at idle and 45-47 psi at 2000 rpm.
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Old 11-30-2010, 03:58 PM   #16
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Quote:
Originally Posted by Jerry Bransford View Post
What model year TJ do you have? Older and newer TJ oil pressure gauges work differently. But Jeepjones probably has the answer, colder temps are probably the reason since colder oil has a heavier viscosity and is harder to pump which increases the oil pressure. Though once the engine and oil gets up to temp it should go back to normal.
I have a 2006 wrangler unlimited. the oil pressure always ran higher in the past winters until it warmed up. However it has never run this high nor does it go away when the Jeep has warmed up. I don't beleive the colder temps. are the issue...

I am guessing that I should probably change the sending unit? Guess I will give it a shot and let you know if it changes anything...
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Old 11-30-2010, 04:00 PM   #17
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I appreciate all of the help and ideas... Hopefully I will have it figured out soon...

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