The engine oil was changed and a manual oil pressure guage installed and a correct psi was shown the monitor in cab when the ignition is off remain light up also while working the machine again low oil pressure reading appears and loss of power
Change the oil pressure sending unit on the eng. if this goes bad it sends the wrong voltage to the computer which will then detune the engine to reduce the chance of damage due to low oil pressure . Good Luck
SOURCE: low oil pressure indicator at low rpms (idle) '97 olds V8
Low pressure when at idle, after the engine has warmed up and the oil has thinned, indicates that the oil pump is worn and needs to be replaced.
SOURCE: oil level system
It may seem obvious but do not operate the engine with it overheating as this can lead to more trouble including a cracked engine block.
Low engine oil pressure is a problem because if it exists, the critical engine parts may not get lubricated properly and may fail. Since you have ruled out external leaks, here are some possibilities:
Clogged oil filter or obstruction in the system
Loose wire or faulty oil pressure or oil level sending switch/sensor.
Possible blown head gasket. This is a serious problem that might be accompanied by white or blue exhaust smoke and a burnt coolant or oil odor. Check for oil contamination with coolant. The dipstick may show a brown milky film/sludge or smell like burnt coolant indicating contamination.
Engine oil pump is possibly bad. This is a serious problem. It's usually time to swap out or rebuild the engine, particularly if it has many miles.
Possible but unlikely in this case is a problem with PCU (Power Control Unit) that runs the Information Center. PCU problems are often indicated by getting other unrelated errors on the info display or "DATE NOT AVAILABLE" for extended periods when you start the car.
You did not mention the Check Engine/Service Engine Soon light being on, but if so I would get the trouble codes read at the OBD II connector. The codes might indicate a sensor problem. Some auto stores do this for free. Either way, I would assume the worse case scenario (bad oil pump) and address it immediately. Unfortunately, due to the complex nature of the car, most things are not easy to diagnose and repair by the do-it-yourselfer. Hopefully though it is just a sensor but with a temperature rise, I would be careful.
Best of Luck!
SC442299
1996 Oldsmobile Aurora
4.0L DOHC 32V V8
Autobahn Option
SOURCE: change oil light remains on
To reset the Change Oil Light:
Open driver's door and open fuse access panel
Turn ignition key to on (don't crank the starter)
Push reset button located in fuse panel
When Change Oil Light starts to flash
Press and hold reset button until it beeps and light goes off
Repace panel
SOURCE: while i'm idling at a dead stop, the oil pressure
Have the oil pressure tested with an accurate mechanical gauge. often the sending unit goes bad, but without testing it could cost you an engine before you find the problem.
If the mechanical gauge shows same low readings, you have internal engine wear (likely worn crank/rod bearings) Then, it's your decision on whether to drive it till it expires, repair it or buy a new vehicle.
SOURCE: Oil Pressure Low Warning
Look low oil pressure is nothing to ignore, serious engine damage will result, have the dealer test the oil press with a special oil press tester, if that checks ok then you most likely have a defective oil pressure sensor.
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