Sudden loss of oil pressure
To start from the beginning, I broke a motor mount, which subsequently broke the distributor in my 94 Xj. Well this happened back on Easter weekend and I have just finally gotten around to fixing the mount and the distributor. About two miles into a test drive, my oil pressure gauge read 0 and I started noticing a tick in the motor which told me I had a genuine oil pressure problem. I immediately turned around and headed home, all the while the motor getting more "diesely" as I drove. Now I KNOW I had oil pressure when I test fired it in the driveway because I could hear the oil draining back into the pan when I shut it off. So what could cause sudden total loss of oil pressure? Can an oil pump just suddenly crap out? Maybe the check valve in the pump seized up from sitting so long?