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Just replaced my Oil Pressure Switch and the gauge is higher than its ever been in the past.

I was leaking lots of oil and replaced the oil pressure switch. My gauge is running high but stays within the L-H at the higher end... If it aint broke...Don't fix it? Any thoughts appreciated.

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2 Answers

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  • 13 Answers

Find out what the oil pressure is suposed to be at when idleing cold and hot and at a certain rpm. Then go get a mechanical gauge from any parts store and hook it up to see what is reads. I have noticed alot of time the switch is working ok, but the guage on the dash maybbe wrong.

Posted on Nov 25, 2014

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For 50 years I never applied that theory,
nor does it make any sense

If you wait until something breaks & then have no
knowledge or experience & lots more damage,
your in a bad place, for no reason, in my world

Not everyone or today no one, works on cars,but the
pros & me & select few old time car guys

I take things apart that do work & are not
necessary to do so,that way you learn & have
a trouble free vehicle,as much as can be prevented

With today's technology your too busy with electronics
& keeping up, to have time for the mechanical, until you
can't wait any longer

First thought is NO ONE coming here show any vehicles
or much if any info

So your switch was leaking?
You replaced it & now is okey,no leak?

So why the different readings?

Is it the correct part?
Was the old part ever accurate- when new?
What should the gauge read?

The only important issue is--what is the actual oil
pressure at different temperature & engine speed

That is what you need to know,is there a problem
mechanically

The gauge issue may stay a mystery,unless you want to
tour several dealers & repairs shops, for just a chat session
& I doubt they will give any advice if they even know,not
for free

I would take the old switch apart- to learn how it works

If it is mechanical like a variable resistor type where you have
one wire to it & the threads are the ground,then you need to
look at scan tool data if avail or test with a volt meter by back
probing the wire to the sensor, to see what the voltage is,if you
can find or figure out what it should be at different pressures

You can also if careful, put an air hose nozzle & pressure on
both switches & an ohm meter or battery voltage & ground
to it, out of the vehicle & test them to compare

Posted on Nov 25, 2014

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Posted on Jan 02, 2017

keemo68
  • 1263 Answers

SOURCE: oil pressure gauge reads past 80

now unless there is a very loud knocking of the motor which would mean that the engine's top end was not getting any oil I would say that your oil guage is sprung and needs replacing. a high pressure rating would indicate a restriction in the oil flow pasdt the sending unit or a plugged oil filter. if the filter were plugged you would know it because your enging would run tight in no time at all. replace the guage itself... please rate this........thanks

Posted on Sep 29, 2008

  • 1 Answer

SOURCE: 01 grand cherokee fan relay/oil pressure

I don't know if this will help anyone, but i had a issue with my jeep running hot and check engine light coming on as well. After alot of trips to different shops - the last one found that there were two senors in the engine for the fan that need to be changed. Everyone would aways fine the one up top but not the second one. After that, have not had any other problems like it since.

Posted on Mar 23, 2009

  • 64 Answers

SOURCE: changed oil pressure switch,still no oil pressure

The fuel pump on that model runs through the oil pressure switch so that if the truck looses oil pressure,It kills power to the fuel pump to prevent engine damage.you need to find the cause of the low oil pressure reading(possibly a bad oil switch).That would be the cheapest place to start,or have it checked with a mechanical gauge.Good luck,
ChevRev

Posted on Mar 30, 2009

  • 50 Answers

SOURCE: 1993 Jeep Grand Cherokee, V6. Oil Pressure Gauge Read High.

it could be the sensor you should look at the oil pressure relief valve

Posted on Jun 10, 2009

  • 290 Answers

SOURCE: Leaking oil from oil pressure switch

I've seen pressure switches rust out and shoot a steady steam of oil out of them, so yes it could cause you to loose two quarts of oil. Book does not mention starter removal:
REMOVAL & INSTALLATION

  1. Disconnect the negative battery cable
  2. Raise and safely support the vehicle.
  3. Drain the engine oil.
  4. Disconnect the switch electrical lead and unscrew the switch. To install:
  5. Coat the first two or three threads with sealer. Install the switch and tighten until snug.
  6. Attach the electrical lead.
  7. Lower the vehicle.
  8. Connect the battery cable and fill the engine with oil.

Posted on Jun 23, 2009

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2 Answers

Oil gauge drops low at idle


Low oil pressure at idle can be caused by an engine with worn rod or main bearings due to (usually) high mileage . This however does not mean the engine is still not serviceable as long as the oil pressure is low only at idle. The pressure should at minimum get into the normal range at anything above idle speed.Not much oil pressure is really necessary at LOW speed. At low speed, as long as there is oil getting to the bearings, even at low pressure, you are OK. In a high mileage engine the oil pressure is often low at idle simply because the oil pump is turning slowly and cannot maintain higher pressure between the larger than normal crankshaft and bearing clearances. As speed increases the pump turns faster and supplies more oil and the pressure should go higher. Low pressure as long as it is only at idle is not a problem. However at higher speeds the pressure should be in the normal range. Such a worn engine can benefit from higher viscosity (thicker) oil such as 20W-50 in above freezing weather and 10W-40 in winter. That will increase idle pressure and the thicker oil film maintains a better film between the worn parts

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1 Answer

The oil pressure guage on my 2000 Jeep Grand Cherokee is registering 0. My oil was just changed and I don't see any indication of oil leaking anywhere. Could it be the sensor?


First off I wouldnt drive your car until you make sure that you have indeed oil pressure and that the gauge is a false reading, driving your car if in fact it has no oil pressure will severly damage your engine, but firstly i would check the oil pressure switch its located on the passenger side of the engine right back from the oil filter make sure the connector is clean and free from oil and corrosion if the connector appears to be in good shape take a paper clip and insert it between the 2 terminals inside the connector your oil pressure gauge should peak at 80 PSI that tells you that your gauge and all related wiring are good and in working condition, secondly remove the oil pressure switch and hook an manual oil pressure gauge up to you engine and start the engine the guage should have a oil pressure reading anywhere from 30 PSI to 55PSI depending on engine temperature if theres oil pressure on your manual gauge replace the oil pressure switch with a new unit, if you still have 0 PSI on your gauge then stop your engine immediatly and start looking at your oil pump and lubricating system for a problem.

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2 Answers

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