87 f150 HELP
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New User
Joined: Jun 2005
Posts: 8
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From: around st joseph missouri
87 f150 HELP
ok this is my first post so please excuse the rambling i might do lol. I bought an 87 f150 4x4 with a 351w and an auto tranny with hopes of having a good cheap truck however after i bought the truck i discovered the 4x4 didnt even work well by process of elimination i discovered a busted outer axle shaft of the front pass. side so i got that fixed (myself may i add lol) so im not real mechanical but i have discovered the oil pressure seems to be low i had a valve cover gasket leaking bad i got it fixed i also changed the oil and filter and just to be safe i installed a manual oil pressure gauge. so this new gauge reads low and i was just wondering if somehow the hole where you put the gauge sensor could somehow be plugged, on cold startup its like 55 psi when its at a hot idle its at like around 0 but there is no bad noises coming from the engine so i guess my question is
if the oil pressure is really 0 wouldnt the engine be knocking or something and the compression is like 132 wouldnt that be affected by 0 oil pressure
if the oil pressure is really 0 wouldnt the engine be knocking or something and the compression is like 132 wouldnt that be affected by 0 oil pressure
Post Fiend
Joined: Mar 2002
Posts: 19,402
Likes: 38
From: Bonita Springs FL
If your oil pressure was really 0 psi, you would hear it. It's not affected by compression.
I find it very strange that the gauge says your pressure is 55 at startup and 0 at warm idle. With the factory gauge, does the red 'engine' light come on at warm idle?
I find it very strange that the gauge says your pressure is 55 at startup and 0 at warm idle. With the factory gauge, does the red 'engine' light come on at warm idle?
Thread Starter
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New User
Joined: Jun 2005
Posts: 8
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From: around st joseph missouri
yes the red engine light came on when the factory gauge went down but as far as i can tell the engine is not knocking or making any other interesting noises
it is kinda hot out right now >90 and when i go drive it around and come to a stop the oil pressure is right at 0 any ideas on how i can find out if this is correct?
also any ideas on how to get the engine light off since i unhooked the factory oil sensor the light has stayed on?[B][I]
it is kinda hot out right now >90 and when i go drive it around and come to a stop the oil pressure is right at 0 any ideas on how i can find out if this is correct?
also any ideas on how to get the engine light off since i unhooked the factory oil sensor the light has stayed on?[B][I]
Post Fiend
Joined: Mar 2002
Posts: 19,402
Likes: 38
From: Bonita Springs FL
You gotta be a little more patient when waiting for a response. Sometimes it takes time, we all have other stuff to do.
If you're really getting no oil pressure, then it's time for a rebuild. If you're skeptical, try another gauge, but you're 2/2 so far.
If you ground the wire from the old sender, it will 'fix' the gauge.
If you're really getting no oil pressure, then it's time for a rebuild. If you're skeptical, try another gauge, but you're 2/2 so far.
If you ground the wire from the old sender, it will 'fix' the gauge.
Thread Starter
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New User
Joined: Jun 2005
Posts: 8
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From: around st joseph missouri
[B][I]im really at a loss here i mean i know im 2 for 2 on gauges but is there any way the sensor hole can be plugged i mean that is a big fluctuation in oil pressure i have another motor i can put in but the compression was only like 126 or somewhere close with a press in compression tester (i know they arent as accurate but thats all i had at the time, i dont have the money for a rebuild do you guys think i should make the swap
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Senior User
Joined: May 2003
Posts: 455
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From: Alaska
If you have 55 lbs cold and it soon drops to 0 as it warms up, you probably have bad main bearings, you may not have rods knocking yet but you can most likely hear the mains, a low rumbly sound, rod knock will follow soon.
It's major overhaul time and a crank kit.
It's major overhaul time and a crank kit.
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