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Low oil pressure, confirmed oil level is good. so before going all the way to changing oil pump, could it be the oil sending unit?

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When the engine is cold the oil pressure should read 60 psi
when the engine warms up at operating temp. it should read 12-16 psi while running at speeds 40+ it should read about 38-42 psi.
it it reads all that its not you sending unit
remember its a GM they use the poorest oil pumps on the market. usually I won't see a pump going out untill over 100K or so. its the same frame as the suberben, yukon, tahoe,denali.
4WD will make the job 3 times harder. If you do have the job done ask for a high volume pump

Posted on Sep 12, 2010

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Posted on Jan 02, 2017

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2003 ford expedition low oil pressure light. car keeps turning off. what is going on here? what is it going to cost to replace the pump ?


replace oil pressure sender switch
change oil filter
then if no better
fit a sandwich plate oil pressure reader between oil filter and block
to get the engine oil pressure when running

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Apr 26, 2017 | Ford Cars & Trucks

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How can i fix the oil pump


see this tips and fix it. God bless you
The oil pump supplies oil to lubricate your engine. If the oil pump is worn or is not turning, the engine will suffer a loss of oil pressure, which may result in engine damage or engine failure.
The first sign of trouble may be a low oil pressure warning light, a drop in the normal reading on you oil pressure gauge (if your car has one), or the appearance of ticking or clattering sounds from your engine.
As a rule, most engines only need about 10 PSI of oil pressure for every 1,000 RPM of engine speed. Oil pressure will read higher than normal when a cold engine is first started because the oil is thick. Oil pressure will gradually drop as the engine warms up and the oil thins out. So normal oil pressure on a warm engine cruising down the highway is typically 30 PSI up to 45 PSI.
SYMPTOMS OF OIL PUMP TROUBLE
The first thing you should do if any of these symptoms occur is to stop your car, turn off the engine, let it sit for a few minutes, then check the oil level on the dipstick. If the oil level is at or below the ADD line, add a quart of oil to bring the level back up to the full mark. Add as much oil as is needed to raise the level to the full mark. Then restart the engine. If the warning light remains on, or the oil pressure reading does not climb back up to its normal range, or the engine noise does not go away, you may have a bad oil pump.
The other possibilities include a bad oil pressure sending unit, or a problem with the oil pressure warning light circuit or oil pressure gauge.
OIL PRESSURE SENDING UNIT
If the engine is NOT making any unusual noises and seems to be running normally, and the oil level on the dipstick is FULL, but you are still getting a low oil pressure warning light or low gauge reading, the fault could be a bad oil pressure sending unit.
The oil pressure sending unit is mounted on the engine block. On some applications, there is a spring-loaded pressure-sensitive diaphragm with a switch inside the sending unit. This switch completes the circuit to the low oil pressure warning light if oil pressure drops below a certain threshold. The unit may stop working if the diaphragm inside fails, if the switch is stuck, if the small hole that allows oil to enter the sending unit becomes plugged, if there is a loose, corroded or broken wiring connector at the sending unit, or there is a fault in the wiring circuit between the sending unit and warming light.
On vehicles that have an oil pressure gauge (electronic, not mechanical), the oil pressure sending unit has a small rheostat inside that sends a variable voltage signal to the oil pressure gauge when the diaphragm moves. A worn spot on the rheostat or any of the other problems just described for the simple pressure-type oil pressure switches can cause a problem.
FORD'S FAKE OIL PRESSURE GAUGE
On many Ford vehicles that were built from 1980 through the 1990s, the oil pressure sending unit has two switches, a low pressure and a high pressure. These vehicles also have an oil pressure gauge, but the reading on the gauge is not a true indication of real oil pressure. As long as the pressure to the sending unit is between high and low, the gauge will read normal. If oil pressure drops and trips the low pressure switch, the dash gauge will now read low. Or, if oil pressure goes up and trips the high switch inside the sending unit, the dash gauge will read high. Consequently, don't rely on the oil pressure gauge for an accurate reading in these vehicles. It is only a gross indication if the oil pressure is low, normal or high.
OIL GAUGE PROBLEMS
If the engine is NOT making any unusual noises and seems to be running normally, the oil level on the dipstick is FULL, and you have replaced the oil pressure sending unit but are still getting a low oil pressure reading on the dash gauge, the fault could be in the wiring circuit between the sending unit and gauge, or the gauge itself might be bad.
Check the wiring connections on both ends as well as wiring continuity between the sending unit and gauge. If no wiring faults are found, hook up a pressure gauge directly to the oil pressure port on the engine and check oil pressure with the engine running. If the engine-mounted gauge shows normal oil pressure but the dash gauge is reading low, the problem is a bad dash gauge.
On the other hand, if the engine-mounted pressure gauge reads low and you have done all of the above, chances are the oil pump is worn, or it is not picking up enough oil because of a restriction or blockage in the pickup screen in the bottom of the crankcase.
OIL PUMP PICKUP PROBLEMS
The pickup tube has a screen on the end to prevent large chunks of anything bad that ends up in the crankcase from being sucked into the pump. But we are talking BIG chunks of debris, not normal wear particles or carbon or dust or other microscopic-sized abrasive particles that can cause pump wear over time.

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Oil light is on oil level is ok


This means that the oil pressure is low or the oil pressure sending unit is bad. Usually the oil sending unit is bad. They go out often, so I would start with having the oil pressure sending unit replaced. It is not expensive, usually and could correct the problem without expensive work. As always if the oil has not been changed regularly then change it and that may turn the light out too. Good luck and have a nice evening. Peter

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2 Answers

Oil warning light flashing mean?


Normally, if you get a oil warning light signal (flashing) could be a few things related to it. Number one, you are low on oil. Check your oil level and make sure it is at full level. Number two, is possibly oil filter is dirty, ( time for service,oil change) or problem with oil pump or oil pump pressure. BUT I would first start with checking oil level and then maybe a oil change.

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1 Answer

My oil light comes on when car idles below 1000 rpms mazda mpv 2003


Your motor oil level is low.
The oil light indicates low oil pressure - at higher RPMs the oil sending unit (oil pump) can create
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If the oil level is good, then the oil sending unit itself is going bad.

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Low oil pressure no start


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Im getting low oil pressure reading on my 95 cadillac deville.. what should I be looking to replace?


always start at the least expensive item. ths would be the oil filter. if its a double wall one,switch to a single. if this doesnt work,then test the oil sending unit. alot of the older caddys do this,and as long as you dont hear lifters tapping,i wouldnt sweat it.

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Oil light


The oil light typically only shows a lack of oil pressure, not a low oil level. Granted, if the oil level is so low that the pump is losing the ability to pick it up, it could activate then since the low pressure situation would be caused by an extreme lack of oil. Also, when was the last time the oil was changed? A clogged oil filter or severely dirty oil could cause an oil pressure drop.

It could be an oil pump failing, or it could also be a bad sending unit (the part that sends oil pressure data to the instrument cluster). Changing a sending unit or disconnecting it and hooking a pressure gauge to the port is usually easier than pulling the oil pan to replace the pump. If it were me, I would start there and make sure it wasn't a false alarm.

Hope this helps, and good luck!

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5 Answers

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Hi, this is an oil pump issue. i recommend replacing this device and the oil screen as well.

The oil pump is a device that distributes the oil throughout the engine. at high rpm's the demand on this device increases dramatically and, if it is malfunctioning in any way, this high demand can not be met and the needed lubrication will be shorted, therefore, tripping the oil light. Most damaged oil pumps can produce enough pressure during low idles but, when the rpm's are increased, the malfunctioning pump will fail to meet expectations. this will cause low pressure and inadequate oil flow. this can also damage the block in time if not corrected.

I would do a quick oil level check to make sure of proper oil level. if the oil level is proper, you will need to replace the oil pump asap. if the oil level is low(1-2qts low), just add to full mark and, run a test drive. if the light illuminates once more, this will confirm oil pump failure and it will need to be replaced.

Remember to replace the oil screen as well.

Please rate and god bless:)

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Do a mechanical oil pressure test to confirm the operation of the oil pump and if its good change the OIL pressure sending unit

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