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HiCustomer Welcome to JA. I am Buddy, and i will try and help you out. The oil pressure sensor could be at fault. I would recomend compare readings to a manual gauge. If pressures are different , then your sensor would be at fault or gauge. Could also compare reading from a reader or laptop and the gauge. They both use the same sensor for oil pressure.The sensor is at rear of block on drivers side of engine. It takes a deep well 1 1/4 socket to take it out. If pressures are the same, i would recomend dropping oil pan and checking regulator and relief valve. These valves are very common to score up and cause pressure problems.If you have anymore questions, just ask.
Also , you said your oil is above normal. I would make sure it does not have fuel in it. If it does have fuel in the oil, this would cause low oil pressure also. If you have anymore questions, just ask.
What pressure is it running? Does pressure just drop off or does it jump around.
That is a little low there. It is possible the sensor, i have seen several give false readings. It is gonna be tough to get to in the century class, and be careful and hold socket straight on sensor, because if it gets sideways a little bit it will break the top off the sensor. I would also inspect wires at the plug, they are very common to rub and short out about a inch or two back from plug. I hope that fixes your problem.
If that dont fix, I would definatly make sure oil is not over full, because fuel will cause low oil pressure. If you have to be towed, i would get a manual gauge hooked and verify it has low oil pressure. Then i would try oil filters and do a plug check and look for metal on oil plug. Then i would check regulator and relief valves in oil pan. I hope this helps you out.Good luck on sensor. If you have anymore questions, just ask.
Sorry to hear that didnt get it. Here are a few things it could be.I would first try manual gauge to verify you are getting correct pressure.If pressure shows different it would be in wiring or ecm. If pressures are the same it could be oil filters,diluted oil, regulator and relief valve, piston oilers, rod bearings, main bearings, or cam bearings. I would think bearings would be okay, if engine was overhauled 2 years ago with genuine detroit parts. I would try oil filters and do a plug check on oil and make sure no signs of metal in oil. If that didnt get it, i would then check the regulator and relief valve in oil pan. I see these valves cause problems alot. Especially the relief valve . I hope this helps you out. If you have anymore questions, just ask. Also let me know what you come up with.
Sorry for the long delay in repsonse. I
You dont have any throttle response? Did this just happen?
The oil pressure sensor is on the engine harness. The tps is on the vehicle harness. It is very rare for this to cause a problem with your oil pressure. But this being said, i have once run into problem with tps wires shorting out and caused all engines sensors to code 5volt supply low.
If you have anymore questions, just ask.