I have a 2007 MDX with 104K miles and recently began experiencing this shudder/judder problem -- this is probably coincidence, but it first became noticeable right after I had the timing belt replaced (by a reputable independent Acura mechanic).
When I take my foot off the gas, I get a shudder. Also, I get the 'rumble strip' effect when driving steady at 20mph. Just like the problem that was reported for 2005-06 models (see this thread
I had my MDX to the dealer last week for a software update for the catalytic converter and mentioned the problem. They said they had just gotten notice of a software update for the transmission that they thought might address the problem.
This was SB 12-029. (I hadn't gotten the letter on this from Acura.)
The software fix was applied and the warranty on the torque converter was extended to 105K miles. I hit that limit in exactly 989 miles.
Unfortunately, I am still having the same issues, so I'm bringing the car back to them and expect to have the torque converter replaced.
It's like déjà vu all over again... I had a 2001 MDX whose tranny went out at 109K miles. Acura did not come through for me that time -- refused to help out on a tranny replacement. I ended up trading in the car (taking a hit in doing so) and getting the new model. The 2007 has been a dream car, no problems whatsoever -- until now.
This time I hope to stay one step ahead of the problem. Will keep you posted on what transpires.
Update: I brought my 2007 MDX back to the dealer 2 days ago and demonstrated the problem on a road test with a technician. (The problem is a mild "jolt" or "shudder" that's felt when I take my foot off the gas after the car has been cruising at certain speeds such as 22mph or 57mph.) The technician felt it and regarded the torque converter as the prime suspect. However, before authorizing warranty work, Acura corporate requires a scan from their diagnostic gizmo while the problem is experienced on road test, so they asked me to leave the car with them so that they could scan it.
They did, submitted the results to Acura, and were told the scan was "normal." Therefore wouldn't authorize torque converter replacement.
The dealer let me know the situation and suggested that I come back so they could redo the scan with me behind the wheel. So that's what I did this afternoon.
After resubmitting it, Acura corporate still said that the scan wasn't definitive, but the service advisor at Hopkins Acura, Redwood City, CA, went to bat for me. She told them, "Look, we've had two technicians who've felt the problem. No matter what the scan shows, there's a problem here, and it needs to get taken care of. You just say no, but don't think it's going to stop here."
And Acura yielded.
So my torque converter will be replaced as soon as the part comes in. :yes:
This is a relief, as the car now has 104,111 miles on it -- less than 900 to go before the 105K warranty on the torque converter expires. Maybe I won't have to revisit my nightmare of 6 years ago when the tranny went out on my 2001 MDX and Acura refused to help me out.
I just hope this takes care of things and I have a few trouble-free years ahead!