Question about 1988 Ford F 150

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1999 ford f-150 drive while warm up oil pressure drops shut off later start it warm.up.oil pressure drops again

We have 1999 f-150 I had walmart change the oil after my husband took it to work on his way oil pressure dropped on his way home from work the oil pressure dropped then clanked for a bit shut down hauled to mechanic and he started it worked find got half way home oil dropped again pulled it home been in our shop for a few months but he goes out starts it and goes about a mile notice it starting to go down he shuts it down cool brings it home what could be the problem how many oil filters are there and located at

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  • Contributor
  • 8 Answers

First, is it a 7.3 power stroke or is it gasoline ?

Posted on Apr 02, 2014

  • Brian Holdsworth
    Brian Holdsworth Apr 02, 2014

    First, is it a 7.3 power stroke or is it gasoline ?

  • Lisa Hulen
    Lisa Hulen Apr 04, 2014

    gasoline

×

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

jgwhomeequip
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SOURCE: 95 powerstroke will not start

Check you IAC Idle air control valve, check your EGR valve. If both check out ok. Then make sure that the glow plugs are glowing properly if this is diesel, if this is gas check altornator and spark plugs.

Posted on Feb 13, 2009

goalie39
  • 469 Answers

SOURCE: truck shuts down after about a mile.then wont restart until it cools down then same thing again

Have you had it checked for codes on the computer, although the check engine light is not on, the truck my have some codes stored in the computer. A common fault for a flame out at speed is the cam positing sensor. there ia a rcall I beleive on these sensors if you have not had it done as of yet, and it will generate a code.

If you are in the US, I understand that if you take you car to an Auto Zone store they will read off the codes for you, once you have the codes then you can plan a course of action.
Other large auto parts outlets may also provide this service as they want your parts business.

Hope this is of some help.
Ed

Posted on Apr 23, 2009

  • 708 Answers

SOURCE: oil pressure problem

Replace your oil pressure sending unit. Usually costs about $10.

Posted on May 28, 2009

Molson02536
  • 3854 Answers

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

gabndan2
  • 35 Answers

SOURCE: No oil Pressure, with knock. then oil pressure returns after turning off engine for a few minutes and cranking back up again.

is oil filter clogged???

Posted on Jun 01, 2009

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1 Answer

My truck loses oil pressure after motor gets warmed up, then if i shut off the engine off and start it back up the pressure goes back up for afew miles then goes back down again


Hi Jasmine:
This sounds quite typical for an engine that has a lot of miles on it.
Doing regular oil changes including changing the filter is important.
Using an oil like 15W40 is appropriate.
If the oil pressure drops below 40 PS at driving speeds you might consider trying to extend the life of the engine by using an additive like STP when you do the oil changes.
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1 Answer

I HAVE SAME PROBLEM


Make sure you are using a genuine Ford oil filter. The Ford filter has pressure valves in it to keep the oil where it belongs. Make sure you are using the proper weight of oil.

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