Fluctuating oil pressure gauge - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 10-22-2012, 01:26 AM   #1
trivium646's Avatar
Join Date: Feb 2012
Posts: 50
Fluctuating oil pressure gauge

Might be a dumb question but is it normal for my oil pressurr gauge to go up and down a lot? Its normal (40) when i am driving but when i am stopped at a light it drops to about 20. Is this anything to be concerned about or is it normal for a 97?

trivium646 is offline   Quote
Old 10-22-2012, 01:48 AM   #2
ed98208's Avatar
Join Date: Oct 2012
Location: Everett, WA
Posts: 391
I asked the same question today about my '98! I just got it a couple of days ago and almost had a heart attack the first time I saw the oil pressure gauge heading south when I stopped - I even pulled over expecting it to die (it didn't). The general consensus in my thread was that it's normal to fluctuate quite a bit depending on whether your foot's on the gas or on the brake.

ed98208 is offline   Quote
Old 10-22-2012, 01:57 AM   #3
trivium646's Avatar
Join Date: Feb 2012
Posts: 50
I figured it was fairly common. At least i know its not just mine lol. Thanks for the reply
trivium646 is offline   Quote
Old 10-22-2012, 02:15 AM   #4
lapis_blue's Avatar
Join Date: Sep 2012
Posts: 210
If u are at idle it will drop down. But when u are at speed it will go back up around 45. The older tj's oil pressure gage tells u what ur oil pressure is, the newer tj's not sure on the year it changed. Will just show 45 or 0 and only if it drops bellow 3 I think it will go to zero. Mostly I think because people always freaked out and asked about it. So they put in a dummy one. But to answer ur question, it's normal
lapis_blue is offline   Quote
Old 10-22-2012, 04:26 AM   #5
Knows a couple things...

WF Supporting Member
Jerry Bransford's Avatar
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 37,767
Oil pressure is generated by the oil pump which is engine driven. Thus the oil pressure varies in step with engine RPMs. Older TJ oil pressure gauges show the normal ups and downs of the true oil pressure. Newer TJs had their oil pressure gauges reprogrammed to not show the true oil pressure and its normal ups and downs because it was unnecessarily alarming those who had never owned a vehicle with a real oil pressure gauge before. The dealers requested it because of all of their upset customers who refused believe their dealers who tried to explain it was normal.
When you have a choice, buy American.

Jerry Bransford is online now   Quote
Old 10-22-2012, 05:51 AM   #6
Blind Dog's Avatar
Join Date: Jul 2012
Location: Des Moines, Iowa
Posts: 591
Now it's just a oil pressure warning light with a needle instead of a lamp.
Next will be the speedo. Going or not going.
In God we trust.
All others bring data.

'02 Sport, soft top, 6 cylinder
5 speed manual, 4" lift, 33.5" tires
~144K miles
Blind Dog is offline   Quote
Old 10-22-2012, 07:18 PM   #7
sargeparrish's Avatar
Join Date: Aug 2012
Posts: 42
before i changed my oil to full synthetic the guage didnt move as freely and as much. now with synthetic it runs at 40 or just a smidge above and at idle its right at 20. its normal. it even seems to rum smoother with the synthetic.

sargeparrish is offline   Quote

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 03:24 PM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC