I posted messages here before for a friend of mine who has a 2002 Jeep Grand Cherokee V8 116k miles.
Several problems now, I will post one per message starting with this one:
When the car runs in idle, the oil pressure gauge goes down right to low. It causes the check gauge light then to come on as well. If you apply some gas, it goes right back to normal pressure which seems to be a little more than half the gauge's scale. I actually performed the last two oil changes for her on the truck and there is enough oil and the right one in there and the oil change is also not overdue.
Any idea? Could I be dealing with a faulty sensor? Or the oil pump going bad? Or the PCV?
Help is as always highly appreciated. Axel