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Engine oil pumps rarely fail. When the oil pressure is low, it's usually due to worn bearings. Other causes are possible, but the oil pump is inside the oil pan on the bottom of the engine. Before deciding that it needs to be replaced, the oil pressure should be checked with a pressure test gauge - not the gauge on the vehicle, because that gauge could be inaccurate. In fact, a defective oil pressure sending unit, gauge or wiring is far more likely than oil pump failure. Be sure the oil level is correct. Compare the reading in psi. to the manufacturers specification. Also consider the oil viscosity. Thin oil gives lower pressure than thicker oil (higher numbers like 40) however, thinner oil flows faster. Use the oil recommended. If the oil pump has really failed, bearings and other engine parts may be damaged. If you really do need to replace it: dodge pick up oil pump
Probably not, as oil pumps are usually "forever" , unless the oil changes are not done and the system plugs up. I'd recommend you find a garage that will remove the oil pressure sending unit and screw in a real oil pressure gauge, and test it. Oil pressure switches that screw into the block fail occasionally, and dashboard oil pressure gauges sometimes fail also. Be blessed.
first thing check is the engine oil level.if oil level okay check oil pressure should be for the 4.2 engine oil pressure should be 12 psi @ 1200 rpm for the 5.3 oil pressure should be 18 psi @ 2000 rpm if oil pressure good problem in the oil pressure sending unit. if oil pressure is low problem faulty oil pump or worn crankshaft bearings if oil pressure low engine will have rod knock.make sure you are using correct oil viscosity if oil too thick you will have low oil pressure oil too thin you will loose oil pressure.
You need to remove the oil pressure sender by the oil filter and put a manual gauge in to see what your oil pressure actually is. The oil pump is fairly easy to replace, just drain out the oil and remove the starter. You can get to the oil pan bolts and then lower the pan. The oil pump is held onto the rear main bearing cap by one bolt. Remove it and lower it keeping in mind that the oil pump drive shaft will come out with it. Make sure the shaft hasn't rounded off, if its worn, replace it.
You could have three possable problems that I can think of. 1) Your oil viscosity is too low and you need to change it to a higher level. A 5w/30 or 10w/30 oil may thin out too much when it warms up to normal temp and shows low on your gauge. 2) The preasure relief valve is partially open due to a small piece of debris caught under the seat. Unscrew the oil filter and look at the small disk that is near the threded part on the filter base. Theres a spring behind it to keep it closed so all the oil goes into the engine and not bypass back into the oil pan. Push up on it slightly with a small tip screw driver and see that it fully seats in the hole, put a new filter on, and try it. 3) If these two things don't improve the condition, get a socket for taking the oil preasure sender off and get a oil preasure gauge to test the actual oil preasure the engine is producing. You may have a weak pump in the engine. If the preasure is within good specs, I'd change the sender unit with a new one.
Let me know what happened-
The Oil light is a dreaded sight, especially at idle. Usually if an oil pump fails, it dies, the same with an oil pressure sender. I had the same problem with a 97 neon, at idle the oil light comes on... (192,000 miles). If the oil used at the oil change was a thinner viscosity than what was in there, that could cause it. If not, it could be bearings going bad on the motor creating a low pressure situation. I fixed it by going to a thicker viscosity, from 5w-30 to 10w-30, and in a week the light went off... this was 7 months ago. Just food for thought, hope this helps.
If this is a new problem since the oil change the oil or filter are the cause. Filters do fail and is between the pump and the pressure sensor most times. So if there is a restriction in the filter the pressure will be low at idle. Replace the flter and see. There is a chance the sensor failed coincidently to the change too. A direct read of the pressure with a gauge will prove that. If you hear any ticking or tapping turn of the engine.