My RDX (139k all highway) recently has been having an intermittent vibration. Drives perfect in city/ under 70. The vibration also does not always occur. It seems to only happen after extended periods of highway driving and it will increase only when accelerating. I have not heard any clicking/popping when turning and i have also replaced my front rotors and tires.I have read that it could be the inner CV axle, but i was curious to see if anybody else has had this issue before.

 

My 07 just started doing this same thing last week. It isn't very bad just noticeable in the steering wheel. I am not super worried, if it gets worse I will look into it. I mean the car is almost 10 years old with 160k. I wonder if our motor mounts are going out. Tires and suspension are good.

 

Check those wheel bearings as well, they can sometimes cause vibrations although they normally are related to lateral loads and not acceleration.

 

My wife's 08 is doing the same thing (129K miles). I've checked all suspension components and nothing has any play. Definitely not wheel bearings. You would have noise and it would change with different lateral loading. Last option is front axles, which I hear (from a mechanic buddy) is a very common issue on these cars.

 

i changed my axles as a why not thing and my vibration went from 60 to 75. so i cruze at more or less then that speed. after the new suspension it went away.