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Topic Review (Newest First)
06-27-2013 10:55 PM
s14sh3r
Quote:
Originally Posted by jherrington View Post
Exactly the same as mine. Except, it runs like a champ, but is a sell out. Sounds good, looks good. Got no horses. Lol guess that's acceptable with my mileage though.
Mine's no powerhouse. 3.07 gears and 31 inch tires. Basically I drive it like it's a 4 speed.
06-27-2013 10:40 PM
jherrington
Quote:
Originally Posted by s14sh3r View Post

Haha, gee thanks

We had our first over 100 degree day today. Oil pressure was at 15 psi at idle after driving it about 30 miles. No noise, runs like a champ.
Exactly the same as mine. Except, it runs like a champ, but is a sell out. Sounds good, looks good. Got no horses. Lol guess that's acceptable with my mileage though.
06-27-2013 10:31 PM
s14sh3r
Quote:
Originally Posted by jherrington View Post
This. I'm worried about mine, but seeing that yours does this too, il know if my engine goes, yours shouldnt be too far behind it!
Haha, gee thanks

We had our first over 100 degree day today. Oil pressure was at 15 psi at idle after driving it about 30 miles. No noise, runs like a champ.
06-27-2013 09:28 PM
Gromus I have an 05 Tj 4.0L. Because of a lifter tick, I installed an aftermarket gauge since I knew the factory one is an idiot light, basically. I hover around 60-65 when cold, and about 16 to 19 when warmed up. Freeway driving stays up around 60. These numbers look ok, it sounds like...
06-27-2013 08:19 PM
jherrington
Quote:
Originally Posted by s14sh3r View Post
It's right at 100 degrees here and after driving a while, mine idles at about 15psi and rises to 30-35psi at speed. I'm not a bit worried about it. Engine sounds and runs great.
This. I'm worried about mine, but seeing that yours does this too, il know if my engine goes, yours shouldnt be too far behind it!
06-27-2013 07:07 PM
Neil F.
Quote:
Originally Posted by TJZ View Post
Ok, I have an 04 TJ and noticed today my oil pressure stays just above the center of the gauge. It doesn't seem to move. Both at idle and driving. ? It's like 106 degrees out, does that matter ? Can someone shoot me an answer or thought as to what I can check ? Only had the Jeep for three months and learning as I go. Thanks in advance.
Read post #8
06-26-2013 05:38 PM
Jerry Bransford As described in the post you quoted, that is how the oil pressure gauge works on newer TJs like yours. Your oil pressure indication sounds perfectly normal.
06-26-2013 05:33 PM
TJZ
Quote:
Originally Posted by Jerry Bransford View Post
The oil pressure gauge on early TJs is accurate. It is only with newer TJs that were reprogrammed to only show a mid-scale reading.
Ok, I have an 04 TJ and noticed today my oil pressure stays just above the center of the gauge. It doesn't seem to move. Both at idle and driving. ? It's like 106 degrees out, does that matter ? Can someone shoot me an answer or thought as to what I can check ? Only had the Jeep for three months and learning as I go. Thanks in advance.
06-14-2013 02:32 PM
ChaddG I'm no longer alarmed, 2001 tj.
engine sounds and runs great.
06-14-2013 02:22 PM
s14sh3r It's right at 100 degrees here and after driving a while, mine idles at about 15psi and rises to 30-35psi at speed. I'm not a bit worried about it. Engine sounds and runs great.
06-14-2013 01:51 PM
Jerry Bransford The oil pressure gauge on early TJs is accurate. It is only with newer TJs that were reprogrammed to only show a mid-scale reading.
06-14-2013 01:47 PM
flflash You didn't say what year or engine.

2000 Jeep TJ from the manual.

4.0L Normal Oil Pressure warm 13psi @ 600rpm. Normal range @ greater than 1600rpm 37-75psi.
2.5L Normal Oil Pressure warm 13psi @ 600. 25-35psi @ 800rpm. Normal range @ greater than 1600rpm 37-75psi.
That's measured with a manual Oil pressure gauge not your dash unit which is highly inaccurate.
06-14-2013 09:00 AM
Jerry Bransford Exactly right. Older Jeeps have a true oil pressure gauge which shows the normal ups & downs of oil pressure. The Jeep's oil pump is engine driven so oil pressure goes up & down in step with engine rpms. A rule of thumb is roughly 10 psi per 1000 engine rpms means it is fine.

Those normal oil pressure ups & downs were unnecessarily alarming some new Jeep owners so at the request of Jeep dealers who were being pestered by worried customers, the gauge was reprogrammed to eliminate the oil pressure changes. Newer Jeeps simply show a mid-scale reading if the real oil pressure is acceptable.
06-14-2013 05:13 AM
Neil F. Note, those with 03+, you do not have an actual pressure gauge. It is a dummy gauge that only indicates one pressure if the pressure is over a setpoint.
06-14-2013 04:22 AM
MarkGLHS mine is always steady at about 50 psi (maybe a tad higher) as long as the rpm's are over 1,200....oil pressure drops to about 30-35 psi at idle. seems like that is an acceptable range for the 4.0L engine with 10W-30 oil.

i'd be concerned if the oil pressure was not at least 40 psi at cruise conditions.
06-13-2013 07:30 PM
ChaddG Thank you for the info.
I have the perfect amount of oil. right at the top of the mark on the dipstick.
I am glad to know that my pressure is ok and not too high.
I always figured high oil pressure was much better than low/no oil pressure.

this weekend comes the new steering gear box with a new pitman arm!
06-13-2013 05:42 PM
Owen_TJ seems right to me...right where mine has stayed the last 2 years
06-13-2013 05:34 PM
jeepwayoflife You have the proper amount of oil in the engine, right? Not too much?
06-13-2013 05:15 PM
Big Sarge I'm not Jerry B. but his answer will be 10 psi per 1000 rpm.

Higher at initial startup is normal and good. It is just thicker oil at startup as its not hot.
06-13-2013 05:12 PM
Jaxon1023 Mine stays at 40 while driving
06-13-2013 04:41 PM
ChaddG
What is proper oil pressure?

I searched my haynes manual and found no info on what the oil pressure should be.

When I start my jeep cold the pressure goes up to 50-60 psi.
It usually stays 40+ on the gauge.
never passes 60.

Jerry B. whats your knowledge bank say?

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