1991 STS, 1992 Fleetwood, 1987 Maxima wagon
Could there be two separate problems here? How many miles are on your car? Can you trace the path of the valve cover leaks down the engine? Front, rear or both covers? There's not much electrical in the way down the engine...spark plugs and wires, a starter ground (on the front just behind the left side of the starter), AC stuff on the front left side. I don't remember what's on the rear but there's still plugs and wires. Does your oil light flicker after it warms up? Is your oil pressure sender socket/connector dry? How old is the fuel? Ever replace any injectors? IAC valve ever been replaced? EGR intake tubes clear? EGR working properly per the FSM? The tricky thing with these engines is that there's enough that's monitored that you can sometime narrow down what's causing the issue but there's far more that isn't hence the ability to run down a trouble tree in the FSM.