Question about 1998 Jeep Wrangler

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The oil gauge go from 20 to 40 and idle to 0 - 1998 Jeep Wrangler

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  • Jeep Master
  • 1,564 Answers

There are probably air bubbles in your oil sending unit line, Try a new one.

Posted on Sep 24, 2009

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Posted on Jan 02, 2017

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SOURCE: oil pressure gage

At idle, at operating temp is there any ticking from top end of engine? Are there any knocking noises brom bottom end?
If no noises, change oil and add some Marvel oil to clean out galleys. If that dosent work, change oil pressure sendingf unit. Also, if you have a mechanical oil pressure gauge, hook it up and take a direct reading. Oil pressure (in any vehicle) at idle should NEVER be less than 15psi. Generally in 4.0 jeep engines it's never less than 30, with a high reading at driving rpm of about 40-60! (but, you did not mention what engine you have)

Posted on Dec 28, 2008

  • 318 Answers

SOURCE: oil pressure gauge goes to 0 when idled, but goes

You could try thicker oil or stop using synthetic or add some lucas oil treatment or change the oil. The sender could be bad too. A diag is in order because if there is no presure the engine will soon die.

Posted on Dec 09, 2009

  • 3600 Answers

SOURCE: oil pressure gauge at 0

It is a possibility but I would check for sure. The oil gauge on that unit is electric not mechanical, you need to remove the sender or find a oil hole port on the side of the block and test the oil pressure to be sure it has oil pressure, if it is then it could be the sender or the wires going to the computer control. 2005 may be under warranty, however do not drive it till you know for sure. I don't remember if they still had the kill switch on that year or not, if the switch was reading zero the engine would not start so it could be something simple like a corded wire or as you said the sending unit. Hope this helps and if you need more help write back or do a chat or e-mail to get more help. You can look up the part at www.advanceauto.com and see what it looks like and get the price list for the thing and look to see if it has one two or three wires before you ever open the hood. if it's a three wire it has a kill switch if it's two it's not. if it's one it gets the signal from the computer and your problem may be the computer. However I don't know if it is still under warranty or not and weather you want to fix it or not. Let me know if you need more help. If you need the procedure for removal please respond to this post. Thanks for using fix-ya. I hope this helped.

Posted on Dec 28, 2009

  • 10 Answers

SOURCE: Oil pressure guage intermitently falls to zero

My jeep also has started doing this. I replaced the oil pressure sensor. Sensor on the 4.7 is above the oil filter, follow the wires, typicaly is a 1 1/16 socket.

Posted on Jan 05, 2010

  • 13 Answers

SOURCE: 99 jeep grand cherokee oil pressure gauge drop

check oil pressure connector for damage,corrotion,oil, clean connection. make sure good ground, 5 volts suplyy and oil pressure sensor signal volts returt to computer. connector have 3 wires

Posted on Feb 17, 2010

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First we would need to know when this occurs. Asuming the oil level is at the full mark!. If the pressure goes up during acceleration and down at idle when engine is fully warmed up, then this is normal. An engine requires 10 psi of oil pressure per 1,000 rpm ( ex. 20 psi at 2,000 rpm, 25 psi at 2,500 rpm, and so on ) . If the gauge is moving back and forth erratically at idle , i would say the gauge is bad. If it drops to 0 while accelerating I would say your oil pump is bad. If from time to time it seems to work and other times it seems not to work, I would say the oil pressure sending unit for the gauge is bad. If the pump failed you would start to here a Knocking noise from the engine in a short period of time. Use the above scenario's to narrow down what it may be.

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The oil pressure gauge goes from 0 to all the way up and the needle moves back and forth while driving it checked oil its good now its clicking underneath the car and it felt like the transmission was...


First we would need to know when this occurs. Asuming the oil level is at the full mark!. If the pressure goes up during acceleration and down at idle when engine is fully warmed up, then this is normal. An engine requires 10 psi of oil pressure per 1,000 rpm ( ex. 20 psi at 2,000 rpm, 25 psi at 2,500 rpm, and so on ) . If the gauge is moving back and forth erratically at idle , i would say the gauge is bad. If it drops to 0 while accelerating I would say your oil pump is bad. If from time to time it seems to work and other times it seems not to work, I would say the oil pressure sending unit for the gauge is bad. If the pump failed you would start to here a Knocking noise from the engine in a short period of time. Use the above scenario's to narrow down what it may be.

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99 jeep grand cherokee oil pressure gauge drop


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99 jeep grand cherokee 4.7 v8 oil pressure drops from 40 at idle to 0 when given rpms. Will come right back to 40 when you let idle again. I have removed pan and checked screen. It was clean. Original...


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1 Answer

Oil pressure gauge goes to 0 when idled, but goes


You could try thicker oil or stop using synthetic or add some lucas oil treatment or change the oil. The sender could be bad too. A diag is in order because if there is no presure the engine will soon die.

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Oil gauge fluctuates back and forth. sometimes


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