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What should oil pressure be at idle.Does the read out on your dash always right.

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My 4.0 reads 18 PSI at idle, but on the 3.5 versions I have a lot of bad oil pressure sensors. They end up reading very high or go off scale at the top. Replacing the sensor fixes it only for a short time. I finally gave up on it.
Should probably read 40 -60 PSI driving.

Posted on Jul 10, 2010


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Oil pressure

If the manual T gauge is giving a higher oil pressure reading than the gauge on your dash - believe the manual gauge.

The oil pressure gauge on your dash receives a signal from an oil pressure sensor. It may well be that the oil pressure sensor is faulty

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Oil pressure reads under the half way point and I know it had the right amount of oil,when you sit there in idle it don't read as high as it does when you are driving it?? Also does a 1997 has a key...

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Oil pressure always changes with rpm.
At idle you should have around 10 psi, and it should max out at high rpm around 50 psi or so.
You not only can't have as much pressure at idle, but you don't need it either.

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The low oil pressure reads out on dash sometimes when coming to idle but goes back up right away sometimes on own or just by tapping gas. the pressure gage is always very steady at about 40 psi.could this...

I only use Mobil 1 Full Synthetic in all vehicles

With 209,000 miles, your going to get those type
issues,because the engine has a certain amount
of built up sludge ,if you want to call it that.

Oil flow will be hindered here and there.

The oil pump-maybe
The sending unit-check it out or replace

Put a mechanical gauge on the engine
and drive it, to at least see what that tells you.

Don't put any additives in the motor.
Stay out of the auto parts store Isle,they
aren't necessary.

I would start testing the alternator and electrical
system firstm as you say at an idle,then goes away

Also go over the entire engine,because it sounds as though
the idle is a little low

Apr 23, 2011 | 2004 Mercury Mountaineer

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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...

From what you just said, it sounds like the problem may be the dash gauge itself. I have only seen one oil pump act like that (mine) .... in that case the pump drive gear was turning on the shaft and slowing down as rpm increased but that is so rare as to be a non issue, especially when the mechanical gauge reads fine. I'd either replace the dash gauge or just install the mechanical gauge permanently on the dash. Doubt if oil in the plug will do that but you can check the plug, clean it and check the integrity of the wires going into it just to be sure.

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While idling sometime my dash show low oil pressure why is that

The sending unit is most likely the cause. If it checks out ok Take a reading of your actual oil could have a faulty oil pump.

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Oil Pressure Guage

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It is best to attach a mechanical oil pressure gauge to the engine and in that way, you can read the exact pressure. If the mechanical gauge reads the same or very close to what you see on the dash, then the reading is correct and if low you will need further diagnosis to determine why.

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the sensor is on the side of the engine block. there's two thing that monitors oil. a pressure switch turns you oil light on and you oil pressure sensor the operates your gauge, start with your sensor. that is near you oil filter that is where it gets it pressure reading from

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1 Answer

Oil gauge goes up and down.

If grounding the dash does not work, try putting a mechanical gauge on it and reading actual oil pressure. Pressure does change while driving, but should not wander. With mechanical gauge, check that running hot at idle (in gear if automatic) pressure should not drop lower than 15psi (I'd rather see 20) High reading should be around 40 -50 but no higher.Low pressure indicates a loss of supply or bad bearing on the crankshaft, high pressure may be caused by sticking pressure relief or restriction in an oil passage.

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