I just got home and the car is vibrating heavily in reverse. It still drives "smoothly" in reverse (no bucking), but with heavy vibration. It did it once in drive then went away, but still does it in reverse. This is like a drivetrain vibration, not specifically from the engine. This is a 2000 E55 41k miles.

 

E55JAY,

It did happen to my Honda Accord couple months ago. Nothing was wrong with my Honda, except the idle speed was too low. Check the idle speed and if necessary adjust it. When it's too low, it caused that problem. Good luck.

 

Just got a message from my dealer, cracked motor mounts?!?!

 

After 41K miles??? I would look for myself before taking it in to have them replaced. I would sooner believe it to be a computer problem.

 

It was definitely the motor mounts, the car is back to normal, the frot left and right mounts were collapsed.

 

Wow! That's not very assuring that motor mounts can go bad so soon. I hope your originals were just defective or something.

 

I have had a few people with e55s email me to tell me they had theirs replaced also, not that is some type of assurance, but it makes me feel a little better.

 

It could be.
I had the same problem with my Honda and they told me to change the 'motor mounts'. In fact, another dealer just adjusted the idle speed and fixed the problem. Who knows what they fixed and what they charged

 

Well, this is new to me, my car never vibrated, but the engine mount that broke was on the driver side, may be yours was the passenger side. it broke right around 41k or 42k miles

p.d. put K&Ns I'm getting upto 23.47 mph on the highway and improved performance.