engine noise

I am having a low type horn/hum noise on it seems like the passenger side of my 2014 ecoboost. It has 16k miles. I just noticed it as it has gotten colder (is it the cold doing it?) its kinda random, but usually only last a second or two around 1500 to 2000 RPM in 2nd and 3rd gears. It sounds...

First of all, Hello to everyone here. Got my new 2014 FX4 supercrew about a month ago. I have to say that I really like the truck and so far have little to complain about even with the poor gas mileage. I was wondering if anybody has experienced a low growling noise that almost sounds like the...