Rep Power: 303

ok, i have a problem every time i start my car and begin to pull out/ back out, as soon as i go a few feet, my car makes this wierd, "brrrmm" sound for like a split second, and it sounds like its coming from the left front tire, so i took it back to the honda place and they said it was just the tire rubbing up against something, so they replaced the tires 4 free, but that didnt do n e thing.... i dont know what it is i hope its not bad... does n e one have this problem? or hear this noise only after they start their car and pullout of somewhere???