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I have a 1989 ford f150 4x4 with bad oil pressure or a bad oil pump?
When I start it, the pressure is fine. After it warms up, the pressure drops to nothing when the engine idles down. I've already replace the oil pressure switch with no luck. The truck has 126,000 miles. Does it need a new oil pump? How can it be fixed? Can a handy person replace it them self? Or how much might a shop charge?
It has a 302 v8, auto.
2 Answers
- Josh SLv 71 decade agoFavorite Answer
I bet the oil pump screen is sucking up trash and making the psi drop after you drive it, Drop the pan and clean it and install a new pump
Source(s): Ford Tech 18 Yrs ASE Master Tech - cimraLv 71 decade ago
I would suspect worn out main bearings, oil is thicker giving you pressure after a start, but once things warm up there is little resistance to oil flow because of the bearing wear and your pressure drops.