Question about 1997 Jeep Wrangler

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Oil pressure guage goes up and down on car , especially when it runs hot, replaced oil pump and still doing it, anyone know why, i cant have a new pump bad.

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Did you check the oil pressure sending unit?

Posted on Apr 23, 2013

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Posted on Jan 02, 2017

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losflip
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SOURCE: oil pressure guage

You can get that oil pressure sender at Napa, Kragen, etc. part is Niehoff # OP25911.

Posted on Nov 30, 2008

csmock132
  • 4669 Answers

SOURCE: Oil pressure goes to high right away as soon a car is started on

Try replacing the oil pressure sending unit

Posted on Feb 27, 2009

  • 1 Answer

SOURCE: 2005 Jeep Grand Cherokee v6 low oil pressure at idle

have a 2000 jeep grand cherokee with 84,000 miles. started having issues with oil pressure gauge going crazy up and down, beeping. had oil pump replaced per mechanics recommendation. didn't help won't hold pressure---only registers about 2. now they tell me i need a new motor!!! just bought vehicle less than 1 yr ago...had carfax clean report!!!!any suggestions?

Posted on Jun 07, 2009

  • 295 Answers

SOURCE: oil pressure gauge goes up when car started, but then down to 0

u Have a problem with the oil sending unit. The sensor is located beack right side of the engine block. Take out the switch and make sure u have good oil PSI. Should be 6 psi at idle and around 50 at 4000 RPM. If the presure is ok replace the switch they are very cheap about 20 bucks. Please rate.

Posted on Aug 12, 2009

  • 6982 Answers

SOURCE: difference between oil sending unit and the oil pressure switch

Same part...make sure you get one for gauge, not idiot light though. If the engine has any knocking or ticking when pressure drops do not drive it and have a mechanical gauge installed to check actual pressure. Parts often have different names for same item...your driveshaft is actually called a propeller shaft!!!

Posted on Sep 18, 2009

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1 Answer

Oil pressure drops to 0 then goes back up


Definitely needs resolving.
Since both light and guage drop occur, problem would appear to be with oil pump or oil delivery rather than simply a bad guage.
You could check to see if there is a common sender that may be defective.
It is also possible that the oil pump pickup screen has an obstruction.
I'd be looking at the recent history.
Has ANYTHING been done to the vehicle that might lead to this problem
Make, model, milage, maintenance history..........
All will help to track down the problem.

Jan 07, 2016 | Cars & Trucks

1 Answer

Hello i have a 97 chevy with the vortec 5.7 when my truck sets overnight first start it knocks really bad and gets louder the faster i go until truck is warmed up then goes away i use a high quality oil...


Locate the sensor for the oil light. It should be on the back of the block roughly in the center, I believe. Either T into it or replace it with a mechanical oil pressure guage. This will likely tell you that your oil pressure is low, especially when cold.New pressure is 30-35 PSI. My suspicion is that you are below 20 PSI which would be normal for high mileage or abuse by a previous owner. If the pressure is down near this,20PSI, then it is time to start looking at either a rebuild or replace. You could prolong it by going to a heavier oil, either 15W40 or maybe even 20W50. They will provide extra lubrication and make the noise go away. If you live in a cold climate, I would suggest a block heater with these oils.

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2003 Silverado. Speedometer,Voltmeter,Oil Pressure gauges are all topped out. Started after replacing alt.


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1 Answer

1992 plymouth voyager oil guage issue


All I can think is that there is fault with the type of oil or the oil pump mechanism or oil pressure switch or oil pressure relief valve. When cold the oil is viscous and the pump will have little difficulty in maintaining adequate oil pressure. As the oil gets hot its viscosity is very much reduced and flows with ease and the pump has to work so much more effectively to maintain pressure. The speed of the pump is governed by engine revs so as you 'press on the gas' that pump whirls around making pressure. As soon as the engine revs drop the hot oil slips past the pump vanes and the pressure drops. Remedy: Use a 5/40 or a 10/50 grade oil. These left number indicates viscosity when cold (5 is less viscous than 10 when cold) and the second number indicates viscosity when hot. If you live in one of the northern states and suffer very cold winters try 0/40 grade as this will cause less strain on the starter motor, battery and oil pump when starting in the cold. Try and choose a large figure (45 or 50) for the second number as this indicates a higher viscosity when hot, a good thing for older engines with greater wear and tolerances. I think it is no coincidence that the problem you have seen started immediately after you did an oil change and this should fix it. If this results in no joy check out the pressure relief valve in the engine block: a tired or broken spring will not allow enough pressure build up. The oil sender is probably OK but "if in doubt change it out". All the above are relatively inexpensive but if they fail to solve the problem its time to look at the oil pump assembly. This should be accessibly once the oil sump cover on the bottom of the engine is removed. You'll need a workshop manual, some good tools and an extensive vocabulary of expletives to call on. Enjoy!

Apr 16, 2010 | 1992 Plymouth Voyager

2 Answers

The oil light comes on at times and goes off as the rpms go up. What can be done about the light?


Maybe your engine is idling too slowly, If the revs are below say 700rpm the low pressure warning light could come on especially when the engine is hot.. If the idle speed is ok try a heavier grade of oil in the engine. Next try a new oil pressure sensor. It's got to be one of these things. Check the engine running temperature . An over-hot engine will cause the oil light to come on too.

Apr 09, 2010 | 2004 Dodge Stratus

1 Answer

1996 chevy corsica,2.2 oil pressure DROP when hot????


dont run it anymore!!!
check oil is reaching the rockers & that there are no blocked feeed holes !
the pump may have been fitted too loose or the gaket is not sealing creating a pressure drop!
it may have some of the old bearing material enter the gallery,s & or the pump!
good luck Cheers Rob

Aug 16, 2009 | 1994 Chevrolet Corsica

1 Answer

1998 toyota camry,4,cylinder, 5 speed


it sounds like your oil pressure sending unit may be plugged by whatever took your pressure down to 5-8 psi the first time. this is extremely low pressure as i am sure you know but at 30 psi your light should go off i would replace the sending unit if your oil pressure is holding 30

May 15, 2009 | 1998 Toyota Camry

1 Answer

1998 dodge dakota magnum v6


It could just be your oil filter.
But most likely a weak pump, or a clogged pickup screen in the oil pan

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2 Answers

1985 conrvette


poss. is fuel pressure reg. problem. put a guage on the test port and check press. should be above 35psi. see if it stays running when you spray choke cleaner in the pcv valve steadily while starting. if the engine stays running after a few seconds of running on choke cleaner then probably a bad fuel pump relay cause the oil pressure switch will keep the pump on without the relay when it has good oil pressure.
let me know if ya can do this or if it helps.

Jul 04, 2008 | 1985 Chevrolet Corvette

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