Normal oil pressure of a 4.7l 2000 wj - JeepForum.com
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post #1 of 31 Old 01-31-2012, 04:35 PM Thread Starter
darule336
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Normal oil pressure of a 4.7l 2000 wj

Curious on what the normal oil pressure level is on the 4.7. It never fluctuates but 57-60 always seemed high.

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post #2 of 31 Old 01-31-2012, 05:46 PM
lost in mud
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I usually run between the 50-60 mark usually tends to stay towards 53-55
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post #3 of 31 Old 01-31-2012, 06:30 PM
13bullets
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Mine runs 57-60, just like yours, usually just below 60 with no variation.

FWIW my 05 Silverado with a 5.3 fluctuates with the gas pedal, the more skinny pedal the more oil pressure, but doesn't drop below 40psi at idle. I'm not real sure why, or which one is proper operation, or if they are designed different and both operate correctly?
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post #4 of 31 Old 02-20-2012, 07:25 PM
65novalt1ss
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Glad I found this. Mine has been running 60-67. Never below 60. When I first bought my jeep a year ago I didn't notice it being this high. It also started using oil when the oil pressure started being higher. Any ideas?
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post #5 of 31 Old 02-20-2012, 08:15 PM
jhc5
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Mine was also pegged above 60 and I had the oil pressure sending unit replaced. Now it changes with the gas pedal from 40 to 60ish. 2001 4.7 V8.
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post #6 of 31 Old 02-21-2012, 06:26 AM
Double E
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That's where mine sits when the sending uinit works. Mine is up for a change again.

'04 Freedom Edition HO & '04 Overland HO (previous '00 Laredo 4.7)
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post #7 of 31 Old 02-21-2012, 06:32 AM
Augie56
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Mine varies between 40 and 50ish under load. 99 4.7L with 81K miles.
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post #8 of 31 Old 02-26-2012, 08:20 AM
65novalt1ss
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Let me back up, mine is a 2002 and does not have numbers. I just assumed 40 was in the middle and 80 at the max. So I really don't know what it actually is but it stays between the 3/4 mark and 7/8 mark but fluctuates with the gas. So is this still a dummy gauge if it moves?
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post #9 of 31 Old 02-26-2012, 10:54 AM
Double E
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No numbers...interesting. Can you post a picture of that or send me to a link where I can see it (you only have 5 posts so you may not be able to post a pic).

'04 Freedom Edition HO & '04 Overland HO (previous '00 Laredo 4.7)
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post #10 of 31 Old 02-26-2012, 09:29 PM
65novalt1ss
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My gauge looks just like the picture above except without the 0 40 and 80. All it has are the dashes.
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post #11 of 31 Old 02-26-2012, 10:13 PM
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Quote:
Originally Posted by 65novalt1ss View Post
My gauge looks just like the picture above except without the 0 40 and 80. All it has are the dashes.
if your worried about numbers just get a mechanical oil pressure guage from auto zone. very easy to install.

but my oil on my 4.7 HO goes from about 45-50 at idle and up to 70 while wheeling.

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post #12 of 31 Old 02-27-2012, 07:00 AM
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Hi

Also have the 2002 with no numbers (maybe only on export models?), if it stays between the 3/4 mark and 7/8 mark but fluctuates with the gas you need a new sendor. Just did mine because of the exact same readings. Now it sits at half way when fully warmed up and gets sort of close to 3/4 (55 as per numbers) when getting the revs up and moving it a bit. Obviously yours could vary slightly based on the health or not of your motor but think this is a good indication of what you should be seeing.

I'm using 10w40 castrol Magnetec, so not sure if this would affect my pressure reading if 10/5W30 is recommended?
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post #13 of 31 Old 02-27-2012, 07:17 PM
65novalt1ss
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Thanks for the replies. I'm going to try to put a picture I found on the internet of a cluster like mine. My big concern also with my oil pressure is that I've been using about a quart of oil every 2000 miles or so. Where is the oil pressure sending unit that I need to replace located?
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post #14 of 31 Old 02-28-2012, 02:43 AM
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Hi

Oil pressure sender is just above the oil filter, take the oil filter off, will drip quite a bit but not too much. The electrical connector on the sender unit is a bit tricky as it has a red tab that has to be slid out before it will disconnect. Mine was dirty and i never noticed the red tab, struggled for ages. Try rotate the sender unit with any tool you can if the red tab is not at an angle that makes it easy to slide out.

You will need a deep socket to get it off and be careful not to over tighten when you put the new one back on as they can snap off!!
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post #15 of 31 Old 02-28-2012, 07:16 AM
ratmonkey
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if your gauge doesn't have numbers, it's not a real gauge.
the oil pressure sending unit is simply a switch that makes contact when the oil pressure is good. the bcm tells the gauge where to sit and to fluctuate with throttle input from time to time so users don't realize it's just a glorified idiot light.
many vehicles newer than 2000 do this. in jeeps, if the gauge doesn't have numbers, it's an idiot light. temp gauges are like this too.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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