I have a 2012 F150 Ecoboost that I have had for about 8 month. Noticed a noise in the front right area upon starting the lasts about 3-5 seconds. Noticed more in the cold weather and upon starting only. Does not repeat during driving. I am thinking that this is something normal for the Ecoboost. Called the dealer and they did not have a clue, which I am not surprised. Sounds like one of those little air compressors that you plug into a cigarette lighter plug.