Hey guys, about three months ago I cleaned my MAF sensor, since I noticed the car was pinging. Before it was cleaned, it had been installed in the car as a remanufactured unit approximately one year prior. IE, completely crudded up MAF in about a year. Yesterday I heard a slight knock from the engine so I figured I'd check it today. Sure enough, the elements were dirty again. I replaced my air filter about two months ago (a month after I cleaned it) with a FRAM (non oiled). As far as I can tell all the hose clamps are tight. What gives? Why the heck is this thing getting so dirty so quick?