Oil pressure cannot be measured at idle should be at least 6 psi at 1000 rpm
and higher with rpm increase if you have no engine noise your oil sender is probably faulty its rare for these motors to fail even with very high mileage
Pressure regulator in the oil pump is bad or there is significant main bearing wear
SOURCE: Low Oil pressure light in idle at stop
Depending on the amount of miles, maintenance records, or how hard the car has been driven either by a previous owner, or by yourself. The engine's main crankshaft bearings or the connecting-rod bearings could be excessively worn.
Also, it could very well be a wiring problem to the sensor and/or computer causing the problem.
SOURCE: oil pressure drops to 0 at idle
OOO not good sounds like some of the head gasket got stuck somewhere, or the gauge or sender is bad or got knocked around when repairing the head gasket. I would check that first. If that checks out will need to drop the pan to see if something got stuck in the pickup tube,might as well change the pump while you are there. Or worst case some thing wrong with gasket job impeading oil flow back to bottom of the engine. Was the oil and filter changed ?if so pull out filter and see if an chunks are stuck in it now. And change oil and filter again. Sorry that was out of order I had a long day
SOURCE: 1996 chevy c1500 w/rotten egg smell,loss of power,rough idle
Your catalytic converter is plugged up,
If you check the exhaust output at the tailpipe you will find it restricted.
Let me know if I can assist further.
Lone99star
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/jason_77a19afa8d604dee
SOURCE: 2005 chevy silverado with low oil pressure
You should replace your oil pressure sensor its cheap and easy to do...
Steve
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