Load humming noise comes through air filter - Explorer Sport Ford Cars & Trucks

Too little information to go by..humming noise..what year/model/engine etc....

however i assume it s a ford and it is most likely caused by a sticky idle air control valve...they tend to hum and "hoot" when sticking, this may be associated with stalling at idle and/or hard starts unless aplying gas pedal. you can identify the idle air control valve as it is attached to most of the engnies by 2 botls and has about a 3-4" silver tube extending abaw from bolts, it is on top of the engine. when these make noise and backfeed through the air box a vibration can be felt from it. there will be a wire goinf to the valve, unplug it whil engine is running and when you hear the humming..if noise gone once it is unplugged...replce it WITH A FACTORY PART!!!

hope this helps