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Re: dropping oil pressure
You need to put a mechanical gauge on it to read actual oil pressure, sometimes the sensor is wrong, have seen the gauge be off (even on newer than yours). The first thing anyone would do is the mechanical pressure test with a screw in oil pressure gauge. That would be my advise.
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I have to ask if you are sure the oil pressure drops first, or the engine stops first. The engine would stop if the oil pressure dropped below 5psi but only because the fuel pump would shut off. And it should start back up if that were the reason.
If something such as a relay or the ignition module is getting hot and killing the engine, it might have to cool down before it restarts. And the engine would stop then the oil pressure would drop to zero.
It could be the oil pressure sending unit, or the engine could really have no oil pressure. If the oil pressure dropped to zero at highway speed, I would expect the engine to lock up or at least make alot of noise. You may have to tow it home and check the oil pressure with a mechanical gauge, or replace the sending unit to see if the gauge on the dash reads pressure. The fuel pump gets power from the pump relay at startup, then runs off power from that oil sending unit when the engine is running.
If there was no noise when it went to zero I would replace the sending unit by the oil filter for a few dollars. If it is a light ticking and it is all the time I would replace the bad lifter but if it is more clanking or thumping you have problems. If you disconnect one plug wire at a time and run it for a few seconds and the noise goes away that cylinder has a bad connecting rod bearing. I would pull the oil pan and replace the bearing. Or just replace crank and connecting rod bearings and get rid of it
Your oil pressure naturaly drops when the engine is reving slow ( stoped ) , the oil pressure sender unit sends power to the oil light when the pressure drops below a preset value.
EITHER the oil pressure sender unit is faulty ( a common occurance ) , or you actualy have unusualy low oil pressure which could be caused by several different problems.
I would suggest replacing the sensor , it it still happens , you have a more serious problem.
Your oil becomes too fluid as the engine gets warmer. When the engine rotates slower at stops, the oil pump won't make pressure. At speeds, more oil is pumped and the pressure rises. Have you recently changed your oil? Or maybe is too old. The real problem would be if you read zero at normal cruising revolutions.
put a can of STP oil additive into the engine if this doesnt work put another one in,if still no joy try changing the oil pump.if you dont want to change the oil pump then put 3 cans of STP in engine and sell it quick