Okay you want some out-of-the-box ideas? So how about draining your oil and leaving your plug out and pulling your oil filter in finding which one of those passages from your oil filter goes to your oil pump and blow some air down it in reverse blow the pump screen off and then do a little flush of carb cleaner through the dipstick to catch whatever cried you dislodge and send it out the drain hole? And actually blowing through their while running the pump in reverse?
