Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Replacing the Oil Pump is quite the job. Before condemning the Oil Pump as the root of the problem here, I would strongly recommend a few other things to look into first. As long as there are no unusual engine noises like knocking or ticking when the oil pressure drops, this could just be a problem of a failing Oil Pressure Sensor. These are common fail items. Over time, the internal resistance wears, and the sensor has a hard time reading oil pressure when not under load (like at a stop sign). I would highly recommend that an "actual" oil pressure reading be taken with the use of an Oil Pressure Tester Gauge. If the oil pressure is within specs, inspect the electrical connector and wire harness to the oil pressure sensor for any loose, broken, damaged or oil-soaked wires. If the visual inspection check ok, replace the pressure sensor. The sensor is located on the top, rear of the driver's side of the engine. If you found this answer helpful, please help me by leaving a rating using the "stars" at the top of the page or click 'accept'.Rating or accepting my answer does not cost you extra. It allows me to be credited for this Q&A.
If there are any other questions you have on this, or you'd like an image showing sensor location or repair manual procedure to replace the sensor... please feel free to reply and ask!
I can provide the procedure to replace the Oil Pump, if that's what you're truly looking for... but again, I'd strongly recommend the items above be done first. Let me know.
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