Awhile ago I began to hear a very noticeable heat shield type rattle under my 08 MDX Tech. 30-40 mph @ around 1200 rpm under a slight load. After a quick look underneath and some pounding on the heat shields, I could not duplicate the sound and so the research began. I saw the dreaded torque converter posts and realized that this was primarily on the earlier models.
Tonight I took another look and this is what I found. This square bracket (see photo if it attaches correctly). The hoses were rattling inside the plastic mount, inside the metal bracket. It was radiating into the cabin (big time) and sounded identical to a heat shield.
I removed the bracket and applied silicone to all of the sufaces that came in contact with eachother. After allowing it to set up for a few hours and a test drive or two later it seems to have gone away.
The only things that still make small question marks fly around my head are:
1. What are the hoses coming from? They lead to a plastic airbox underneath? One (pictured) is dead ended.
2. Did my MDX always drop down into that dreaded lower gear at low speed or did I just notice it when the rattle began?
3. What made this rattle just start all of the sudden.
Anyhow..........its fixed. I just wanted to share it being as how I have seen other posts on this issue with no solution. This is not by any means the first place I would have looked.
Not sure if those hoses are the same as the ones I had issues with, but I had an rattle under the car and it was determined it was the evap hoses attached to the rear climate control. Issue now came back after a year.
Mesalum, what did you find? I could not duplicate the issue while I was at the dealer and needless to say, the noise is back after two days with a vengeance.
Well, it's only 10 months later and I think I have solved my noise, rattle problem. I lived with the noise for the last 10 months. I tried Jrock's suggestion of sealing around the plastic holder in the metal bracket. That did not solve my problem. So I started looking at the evap lines coming from that plastic holder. I discovered there is a small and large diameter line that were very close to each other. So I surmised that maybe once the vehicle warms up they could be close enough that with some vibrations they might knock against each other. So I got a plastic lock tie and tied them to each other. Well the noise has not come back yet.
Posted are a couple photos titled from_the_front and from_the_rear. The name implies the perspective of the photo. Taken from under the vehicle from the front of the connection and from the back of the connection.
2007 MDX Tech Aberdeen Green/Ebony Delivered 1/30/07 VIN 519189, with new engine at 97K miles
After my last unsuccessful visit to my dealership, despite me telling them where the problem was, I followed the OP's method as well and it solved my problem for about 8 months now. With temperatures getting lower, I have heard it a couple of times, but it doesn't bother me because I know how to fix it now.
Thank you for this post. I have been having similar issues with noise rattle from my MDX. I assumed it was the heat shield but after inspection everything appeared fine. I'll give recommendations a try by tying the pipes, hopefully this will resolve this issue of the annoying rattling noise.