Just curious, I have noticed from time to time that I will hear a pronounced thump from the drivetrain that sounds like it is comming from below and behind the drivers position when I am accelerating from a stop with the wheels in a 90 degree turn.
This only has happend when the car is being accelerated from a dead stop, making a right turn into traffic. It almost sounds like it is running over something. Not really reproducable at will, but has happened enough times to make me go hmmmmm..... since the left rear wheel should be getting a dose of sh-awd in this case.

 

It could possibly be the same problem described on this thread:

Link

I hear a similar clunking sound when backing out of the garage and going into drive. I thought I heard the same sound once when accelerating from a dead stop at an intersection, but it wasn't as pronounced.

 

I heard it once when I started a brand new rdx on the lot. The salesman couldn't/didn't say anything when I asked. It was weird, because it happened when I started the car.

[start] 1, 2, 3 [dooomp!] huh?

 

If this is a sound you're hearing right after you start up the car after it has been sitting for a while, it's the ABS self-check. Otherwise, it's something worth a trip to dealer.

 

maybe motor mounts, i am replacing mine friday, we will see if the sound goes away in mine. but i have same problem