At low RPMs I can hear my VCM kick it. Sort of an exhaust shield type rattle. May be it is from the vibrations. But I definitely feel the VCM. It is subtle but I have acute hearing for these kinds of things.rwMDX01:
Since the above comment is valueless, I'll offer at least a possibility - it may be the VCM kicking on/off that you're noticing. I actually rarely notice it on my 2014 since it's really a quite smooth and quiet function in the MDX but depending on exactly how you're throttling at the time you may find it more noticeable or maybe your particular MDX is just noisier than others in this area.
Of course, the VCM might not be it but it's a possibility. If you can readily replicate it and if it's annoying you, have an Acura service tech do a test drive and diagnose what it is.
This may help then (see attachment). I did exactly what the TSB mentioned and assumed it was the torque converter chattering being described as grunting lolThanks everyone for the comments and feedback. I debated on how to best describe the noise I was hearing as "grunt" or "vibration", but the video on the Edmunds thread is exactly the noise I hear. I can get it to replicate pretty easily and think there is a connection to when the "a/c" is on. I'll have my local dealer take a look at it soon.