I suspect that the oil filter is one that doesn't have a anti drain back valve in the base of it needed for hydraulic tappets. have the hydraulic tappets check for a leak down test as they wear and by-pass oil The oil may be to thin for a car of 173.000klms I consider you should be running 30w-50 oil. The cheapest way out is to change the oil and see if it makes a difference.
SOURCE: sudden change in oil pressure gauge
It is normal on a Chevy for the oil pressure guage to fluctuate based on the rpm's of the engine. The faster the engine is turning, the higher the pressure. If it is fluctuating without a change of engine speed, then you may have a REAL Big problem such as low or no oil in engine or the oil pump itself is going bad. Could also be a blocked oil filter. You surely change your oil regularly....right?
SOURCE: Low Oil Pressure on 1992 Chevy 1500 Pickup Truck
1992 silverado pickup has a problem with the oil pressure Gage on the dash board fluctuate when i put break on or accelerate the gas
SOURCE: 2001 Dodge Dakota 3.9L oil pressure
The pickup tube is a bad design in these engines, I have fixed several with the same problem, you can weld on a GM screen move it 1/4 of a inch away from the pan or add 1 inch to the bottom of the pan, (use a high volume pump) the problem is the screen is too close and too small and will pick up any sludge off the bottom. also it's great to make a access plate on the bottom of the pan using a Volkswagen Bug oil cover plate, it can be removed with bolts after a oil drain to clean the screen without the hassle of removing the whole oil pan by lifting the engine on these trucks. Good Luck
SOURCE: oil pressure problem
You oil pressure sending unit has gone bad, it's common to go bad and some even leak oil.
The oil pressure sensor is on the back of the block on the passenger side, you can get to it from the top and not from the bottom. There are (2) switches back there that screw in to the block and you can only see it from the top of the engine. The Oil Pressure Sending Unit is the one wire harness with a green and white strip on it. The other switch has more wires to it.
When you pick up the new sensor, make sure you get the right one. make sure you get the Oil Pressure Sending Unit which sends variable oil pressure and has only one quick connect for the wire connector. The oil pressure switch is the one that only activates the oil light on older engine.
Once you get the right part at Auto Zone for around $9.00, disconnect the wire clip with the green with white strip on it. and use a deep spark plug socket with a extension and u joint to get the sensor out. The sensor comes with teflon tape already and no oil should leak out from the block. It as simple as replacing a bolt and reconnecting the wire connector.
Good luck and hope this helps, take no more then 10 min to do but about 5 hours for the engine to cool off LOL
SOURCE: 1999 Buick Regal GSX won't stay running......
It's probably the mass airflow sensor and/or oxygen sensors.
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