Oil pressure guage! - JeepForum.com
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  • 1 Post By ShelbyB
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post #1 of 12 Old 09-11-2019, 03:03 PM Thread Starter
ShelbyB
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Oil pressure guage!

I drive a 2002 jeep grand cherokee laredo v6 4.0L...Okay soooo....last week I noticed my oil pressure was super high. So Saturday we went to the parts store and got a can of seafoam and everything to do an oil change (6 quarts of oil and a new oil filter). Dumped half the can of seafoam in the oil drove it for about 20 minutes and then did an oil change. It was still reading high. So we went back to the parts store and picked up a new oil pressure switch. That did the trick and my oil pressure gauge was finally reading normal. Well fast forward to this morning...I'm driving to work and slow down to stop at a light and it dropped to 0...started going again and it went up to 40. Everytime I stopped it dropped to 0. What do I do next???

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post #2 of 12 Old 09-11-2019, 07:56 PM
rjbruzan
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Your gauge had failed. The new one has a loose connection or has also failed. The 6 cylinder gauge is a fake, it only reads pressure or no pressure like an idiot light. So it reads, does not read or pegs when failed.
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post #3 of 12 Old 09-11-2019, 08:20 PM
CarlJH
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not all gauges are fake, early WJ's had proper gauges, then around 2002 the changed to the dummy gauge which is either 0 or just past half way mark.
various ways to tell which you have have been posted, if its got numbers its a real one, if it just has Low and High its the later fake one.
sure fire way to tell is by the number of wires that plug into the sender, 3 wires-real, 1 wire-fake
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post #4 of 12 Old 09-12-2019, 09:21 AM
Bateman69
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Had similar issues on my 2000 4.0

Get a Mopar oil pressure sending unit. Any other brand will fail.
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post #5 of 12 Old 09-22-2019, 11:11 PM
IturrGuate1975
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Hi guys, I have the same problem. My level it is top high, but when I acelerate the gauge goes down. So, in your opinion, this medition means that the engine van be damage??

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post #6 of 12 Old 09-23-2019, 11:17 AM
rjbruzan
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No
Most likely the sending unit has failed.
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post #7 of 12 Old 10-23-2019, 02:39 PM Thread Starter
ShelbyB
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Thank you sooo much for suggesting the mopar sending unit! That did the trick and my gauge is correct now!
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post #8 of 12 Old 10-23-2019, 02:58 PM
Double E
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Note that the Mopar will fail too. Remember that it was what was in the Jeep when it began to leak or cause errant readings depending on how it failed.
It might take longer to fail than the parts store unit but it will.
The issue then becomes what it cost, then who warrants the item for life?

'04 Freedom Edition HO & '04 Overland HO (previous '00 Laredo 4.7)
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post #9 of 12 Old 10-23-2019, 07:32 PM
2oldjeeps
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i got my single wire variable sender at autozone. works fine and proper.
if the reading changes with temp/rpm, its not an idiot light!!
oh got one for 2000xj 4/0 and one for 04 wj 4.7. both one wire variable.
turn the key 2 seconds with sender out to clean the hole

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post #10 of 12 Old 10-25-2019, 08:15 AM
Double E
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Single wire. That's the idiot gauge. It does not change with temp & rpm.
If the sender sees any signal above like...5psi, the needle goes to about halfway. That's all you get.
Your '99 WJ was a full variable sending unit. The '04 is not.
Have a look: http://wjjeeps.com/newoptions2.htm

'04 Freedom Edition HO & '04 Overland HO (previous '00 Laredo 4.7)
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post #11 of 12 Old 10-25-2019, 12:59 PM
2oldjeeps
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u r rite!
funny , the 4.7 , 04, would go from zero,then normal then full scale.if its a switch,why full scale.


new one is normal and does not move, my error

99wj,143,000 miles
00xj,177,000 miles
10hummer3,74,000 miles
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post #12 of 12 Old 10-25-2019, 03:46 PM
Mjmmkerr
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One thing to remember on these gauges, why they are there. If the sending unit has been replaced preferably with a Mopar version, and you still end up with near 0 readings at idle, light comes on, etc., then you may have a bigger issue. I bought an '04 4.7l that had this issue. At first I thought it was the sending unit. I changed it with the AZ version, didn't help. Changed it with the Mopar version, better, but after about 10 minutes of driving, pressure dropped at idle again. While driving, the pressure would go back to normal. I put a real pressure gauge routing it where I could see it and press the accelerator at the same time. Pressure gauge dropped to 4 psi at idle. While this is the minimum pressure at curb idle, what this really meant was the clearance on the bearings were getting out of, or close to out of tolerance and oil was bypassing the oil ways in the motor. Time to change bearings. I opted to get a used motor and installed it so I have time to go through the original motor and rebuild it. Of course it has been sitting in my friend's barn for the last 10 months, but who is counting...
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