Noise at 2000 rpm

[Jaysony]

Hello:First time poster here. I bought 2005 X5 4.4 6-speed auto, with Sports package (47000 mile) last month and enjoyed it very much, except some kind of noise and vibration issues. Not sure if it is normal and would like to share with X5 owners to get some inputs, before I visit the Dealer, the car is under CPO warrantty.
The noise appeared at 1950-2000 rpm at all speed, no noise and vibration when rev the engine in Park. It is noticeable during either RPM going up or going down (when I take my foot away from gas pedal) to pass the 2000 rpm mark. It sounds like hmmmmming noise, and I could feel the vibration from the gas pedal and floor, but when I put my hand on the gear shifter, I do not feel the vibration.
It is more noticable on freeway when I coasting around 60 mph, the RPM is right at 2000 rpm, the noise is constant there. If I speed up to 65-70 mph, the RPM to 2200, the noise disappeared, I could only hear some typical wind and road noise.
Any inputs are appreciated.

Thanks
Jayson

[anerbe]

does it change depending on whether you have your HVAC blower fan on or off? I had a similar issue with a humming type noise between 60-80 that sounded like someone trying to hum and whistle at the same time. it was faint, but very annoying as it only appeared on the highway. it would disappear when I turned off the HVAC fan. it was present as long as the fan was on, independent of fan speed.

turns out there a TSB for new valves for the evaporator drain tubes, which the ends can transmit noise/vibration from the engine. I found the diagnosis on this forum. Told the SA, and they updated the ends. No more noise/vibration = happy camper.

Unfortunately, noises/vibrations can be anything from an HVAC drain tube to the drive shaft. Good luck!