Question about 1990 Ford F150
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Posted on Jan 02, 2017
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
Any time the oil pressure is 0 you take a chance of locking up the motor. The only way to know for sure is to put a pressure gauge in the oil pressure sending unit port on the engine and see what the pressure really is. At that point you will either have the peace of mind in the knowledge that the sending unit is really bad and needs replacement or you can then contact a repair shop and tell them what your testing has revealed. I wouldn't drive or run your truck while the oil pressure is at zero.
Posted on Nov 10, 2008
Hi, this is a faulty oil pump and , it should be replaced asap. make sure the mechanic replaces the oil screen as well.
You can test the pressure gauge and True oil pressure by using the guide below.
Testing the Oil Pressure Gauge
* Test the gauge by grounding the wire that leads to the sending unit on the block.
* When the wire is grounded with the key switch on, the gauge should show maximum oil pressure, or the light should go on.
* If either happens, the gauge and wiring are good and the sending unit is at fault.
Testing Oil Pressure
Pressure can be tested by temporarily installing an oil pressure gauge in place of the sending unit. Before testing, look up the oil pressure specifications for your vehicle in the appropriate service manual.
* Bring the engine up to operating temperature.
* Now shut the engine off.
* Locate the oil pressure sending unit; usually it is on the lower side of the engine block.
* disconnect the wire from the sending unit and use an Open Ended Wrench to remove the sender. using pliers can damage the unit.
* Tighten the oil pressure test gauge into the hole in the block where the sender was removed.
* Check the engine's oil level and fill, if required.
Be extremely careful when working near a running engine. Always wear safety goggles or glasses with side shields when working around moving machinery and be sure that your clothing is not loose.
* Now turn the engine on and check the oil pressure on the gauge.
o Watch as the engine warms to note any excessive drops due to temperature.
o Make sure the engine speed is set to specifications for testing pressure.
o if necessary, us a Tachometer and adjust the engine idle speed.
* Record the measured oil pressure, then turn off the engine.
* Compare the test results with the manufacturer's specifications.
o If the oil pressure is within specifications, this shows that the oil pressure sending unit may not be working correctly.
o In many cases, replacing the oil sending unit will correct the problem.
* After the test is complete, reinstall the oil pressure sending unit, start the engine, and confirm there are no leaks.
Posted on May 27, 2009
SOURCE: oil pressure problem
You oil pressure sending unit has gone bad, it's common to go bad and some even leak oil.
The oil pressure sensor is on the back of the block on the passenger side, you can get to it from the top and not from the bottom. There are (2) switches back there that screw in to the block and you can only see it from the top of the engine. The Oil Pressure Sending Unit is the one wire harness with a green and white strip on it. The other switch has more wires to it.
When you pick up the new sensor, make sure you get the right one. make sure you get the Oil Pressure Sending Unit which sends variable oil pressure and has only one quick connect for the wire connector. The oil pressure switch is the one that only activates the oil light on older engine.
Once you get the right part at Auto Zone for around $9.00, disconnect the wire clip with the green with white strip on it. and use a deep spark plug socket with a extension and u joint to get the sensor out. The sensor comes with teflon tape already and no oil should leak out from the block. It as simple as replacing a bolt and reconnecting the wire connector.
Good luck and hope this helps, take no more then 10 min to do but about 5 hours for the engine to cool off LOL
Posted on May 29, 2009
If you don't hear any ticking or knocking while the pressure gauge drops, the problem is probably a failing "oil pressure sensor". If you do hear a ticking or knocking, the problem is probably a failing "oil pump".
Posted on Jun 03, 2009
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