Vibrations

[ShawnBehrens]

I have a 2007 QX56 with 80,xxx miles. Whenever I turn it on and let it sit for a minute, The floorboard starts to vibrate. It's like it is trying to switch into a transformer. It's very noticeable and you can hear it outside of the vehicle as well. Its new to me and I have not a clue whats going on. Any guesses?

[marctronixx]

sounds like the muffler hanger is loose. take it into a muffler shop and have your exhaust hangars replaced.

while you are at it, get a magaflow muff!

[Boatpuller]

its probably the automatic rear air bags filling if the sound starts about 1 minute after you start the truck