low oil pressure

FORD AEROSTAR
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I have a 1991 aerostar van, it has about 119,000 miles on it it set in my brother in laws yard for five years, he parked it because he got a new work van,
it has a 3.0 motor i have fixed alot of things on the van but my oil pressure drops after the van warms up but if i cut the engine off wait a few minutes and start it back up the pressure comes back up for a few seconds, I know it isn't the sending unit because i can hear the lifters begin to tap, is it the oil pump or something more serious.
Sep 30, 2007 at 9:58 PM
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RASMATAZ
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Could be excessive bearings clearance/pick up screen and oil filter/pump.

Best way to find out remove the oil pressure sending unit and attach an oil pressure gauge and read off-
Sep 30, 2007 at 11:32 PM