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Oil pressure drops

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Once my truck gets up to temperature and I stop or let off the gas peddle the oil pressure gauge drops to zero. Even does it on highway if i let off gas. Seems to be rpm related, at idle if i tap the gas the gauge goes back to normal. Took it in to get checked and of course they could not replicate problem to get a code. Changed oil and filter twice. Switched out oil pressure sensor still happens. No engine noises.

Has anybody had this happen and waht was the fix?
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Ol pressure

I recently changed out my 4.7 in my 02 Ram with a Powertrain Products engine. My old engines pressure would drop to zero at stop lights also. I went straight to the oil pick up screen when I pulled the engine. It was pretty clean(which was a suprise}.
 

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good to hear...my 5.9 did it too...it was the sensor...sounds like you had a faulty one firt time around...which unfortunately is pretty common...
 
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