Just wanted to pick your brains on this:
My oil pressure gauge, cold, sits at 19-22psi. This is with 10w30 synthetic on a motor with 120k miles.
Once the engine temps get around 200-220, the oil pressure at idle sits at about 12-15psi.
The engine continues to get hot but the temp gauge "sticks" at about 230, but doesn't go past it. But at that temp, the oil pressure drops at idle to about 10psi.
The funny thing is, once i tap the throttle (in neutral or what not), the oil pressure gauge goes right back up to 12-15psi where it should be.. Stays at a steady 19-22psi when I'm driving.
The weirdest part.. is that as I come to a stop, the oil pressure starts to drop. Once I'm completely stopped, the oil needle drops to about 5psi, then bottoms out at below 0psi. Tapping the gas shoots it up to about 15psi again, but then it'll drop to 5psi, then back to 0psi. Also, when I turn the engine to the "ACC" position (popping it out of IGN but keeping accessories on), the oil needle goes back up to 19-22psi.
Any ideas? Could a broken oil pickup pump cause this problem? Or could it be crossed temp/oil gauge wires? I'm confused and don't know where to start.
Would love any advice.