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It is not a big worry if the oil light comes on at low idle, but it should go off as soon as the revs rise a bit. I'd recommend
- change the oil AND FILTER with the correct grade, to the correct level.
- ask a mechanic to temprarily replace the oil pressure sender with an oil pressure gauge, and with the engine HOT, rev the engine up and down to see what pressure there is. You should have roughly 10 psi per 1000 RPM.
If the pressure is very low, ask the mechanic to check the oil pump and engine bearings. If you are not burning oil with lots of blue smoke from the exhaust, it is unlikely the bearings are worn.
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The engine produces oil pressure from the resistance(clearance ) between the bearings and crankshaft and the sending unit lets you know when there is no pressure. These switches ground the light in the dash around 5 psi. So as the engine gets warmer then the oil gets thinner with large amounts of clearance pressure drops. Test system with mechanical unit normal hot idle pressure should be 30-45 psi if low raise idle speed comes up then engine bearings are worn.
the shutdown relay does that. Check cooling system and
oil pressure sensor. engine gets too hot or not lubricated enough that the ECM tells the shutdown relay to shutdown the engine.
Do you mean the oil level sensor was replaced, or do you mean the oil pressure sending unit was replaced?
If it was the oil pressure sensor was replaced, then I would look into an oil pump going bad, not supplying enough pressure to the oil pressure sensor. This can be tested by putting an oil pressure gauge into where the oil pressure sensor normally goes, bypassing the circuitry that leads to the dash light for the oil pressure.
If it was the oil level sensor, then check for bad wiring.
try running from the relay to pump see if it runs it should...I think its a bad connector under the truck bed or the relay is the culprit?
Not sure on that perhaps give the service dept in the dealership a call on that.....however i do recall on certain vehicles a low oil cut out switch was incorporated to stop engines from being driven with no oil.....is the oil level Ok??
Do you have a twin tank switch that is not operational?
Oil light relates to oil pressure, not oil level. If engine has not been rebuilt, it is safe to assume that it is nearing the end of its life. Low oil pressure light goes off on increased rpm´s , and hence, pressure goes up. You can extend the life a little bit by switching to heavy oils, such as 20W-50, but eventually it also wont be enough, and will start fouling the plugs. Check the oil level, because extremely low levels of oil can also produce a low pressure warning.
Be sure to check your oil level, which I'm sure you have, and be sure your reading the dipstick correctly, by rolling it over and being sure level is same on both sides. My guess is that maybe your sending unit is getting a little sensitive. What will happen when you stop, the oil in the pan shifts forward enough to starve the oil pick-up in the pan enough that the oil pressure will drop just enough for the sending unit to alert you. The other possibility is sludge build up in your engine, is not allowing oil from top of engine to drain back down to pan fast enough, thus your basically running with low oil level all the time. Do you and have you change oil often ?
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