Question about 1991 Ford F150

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How to you check to see if the oil pressure guage is bad or if there's a pressure problem itself?

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Oil sending units go bad much more often than oil pressure guage. If you were to take it to a shop, they would test the oil pressure to determine if the pressure is acceptable. I would just go ahead and replace the sending unit as that is not expensive. If that corrects the low reading, and it probably will, you just saved a one hour diagnosis at $90 to $100 an hour. Hope this helps :O)

Posted on Mar 31, 2011

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You have to remove the oil pressure switch out of the motor and install an oil pressure gauge and check the oil pressure cold,warming up and hot to make sure the pressure is good through out the temp range.if the pressure is good then you could just have a bad oil pressure switch.if these check out good then the only thing left is the gauge on the dash,this doesn`t happen often.

Posted on Mar 31, 2011

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Connect test leads to the guage and apply 12 volts, if the guage activates upward this works, if it's the oil preaaure in regards to the oil pump, you need to hook up a oil pressure guage.

Posted on Mar 31, 2011

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Posted on Jan 02, 2017

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SOURCE: low oil pressure at idle

how low does the oil pressure drop?? is it below 40?

Posted on Mar 05, 2009

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SOURCE: Temp guage read hot, volt guage reads low, and oil pressure guage tops out. Could this be a bad ground?

Possibly, i would check the sending unit and of course the wires that connect to the temp prob. They often become worn or even short out on other wires. I suspect that the gage is telling the truth and you have a blown head gasket. Check the oil for water. Check the water level and see if you are losing water. good luck

Posted on Jun 03, 2009

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SOURCE: oil pressure guage not working. check engine light

Sending unit should be in this location. This is a cheap part that likes to fail.dec59d3.gif

Posted on Feb 04, 2010

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