Oil pressure guage! - JeepForum.com
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post #1 of 4 Old 09-11-2019, 02:03 PM Thread Starter
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Join Date: Sep 2019
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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 4 Old 09-11-2019, 06:56 PM
2004 TJ Wrangler 
Join Date: May 2008
Location: Lake in the Hills
Posts: 3,087
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 4 Old 09-11-2019, 07:20 PM
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2003 WJ 
Join Date: Feb 2010
Location: United Kingdom
Posts: 770
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 4 Old 09-12-2019, 08:21 AM
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2000 WJ 
Join Date: Dec 2018
Location: Hubbard
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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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