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88 F150- no oil press. on guage

D

Don-Wi

Well-known Member
I started my truck the other night (88 F150, 300/4.9 6 cyl.) and the guage never came up for the oil pressure. I shut it off and pulled the dipstick- could tell oil was being splashed around because it was splashed onto the dipstick. Didn't need to use it so I left it sit overnight and looked at it again in the daylight. Again pulled the dipstick and it was at the full level, started it up the guage ever moved but the oil was splashed onto the dipstick again. It also quiets down so I know it's geting oil.

I'm thinking the pressure sensore failed. What I need to know is where it is on the block. It's been not quite a year since I changed the oil because it only gets maybe 3000 miles/year anymore. Might have 1500-2000 miles on the oil right now.

Donovan from Wisconsin
 
My 89 plow truck did it to me also, my connector is sometimes not making contact at the sending unit.

Check that connection first, hopefully it's that simple.
 
I am sure it is below the manifold on the left side on the block, it will have one wire running to it.
 
If yours is like my 91 F150(4.9L six), that gage really isn't a gage. It's more like a mechanical idiot light, either off or on. It doesn't really show pressure, and the sending unit is just an off-on grounding type switch. It was the first truck I ever had that didn't show a little lower oil pressure when idling hot. I finally got curious enough to check into it.

Paul
 
Use it like a idiot light. got tired of changing mine in a 89 bronco with 4.9. Mechanic from ups said their ford del vans had this problem all the time.
 
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