99 dodge ram 1500 oilpressure loss

oil press. up on start up,then falls after driving for awhile.turn off, then start up, press.up,then drops.

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TheReg wrote:

How high does it go, how far does it drop and did this just suddenly happen?
Does the pressure change between idle and higher RPM's?
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Just started about 4 days ago. Sometimes it goes up to 80 or 90 PSI, then it will drop to midway on the gauge and then all of a sudden it will drop all the way down. Today it went to about 50 PSI, dropped all the way down 3 times within an hour's driving time, then it comes back up by itself to 50, then when I shut it off and turn it back on it went up halfway, dropped down about 10, stayed that way for about a 45 min drive. I appreciate your interest and any ideas you might have.
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Probably just a bad sending unit. To verify, remove the sensor (on the top of the engine, at the very back - to the right [passenger-side] of the distributor), and hook up a mechanical pressure gauge. Run the engine for a little while, and make sure the pressure remains constant. Vary the throttle, and make sure the pressure varies accordingly.
If that checks out (or you just want to gamble a little and buy a new sending unit right off the bat), put in a new sending unit.
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Asking "TheReg" Hey I have the same problem with my 2001 Dodge Ram 1500. So did the new sending unit fix the problem??? if not how did you fix this problem???
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