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X5 E70 (2007 - 2013)
E70 BMW X5 produced between 2007 and 2013. Discuss the E70 X5 with other BMW owners here.

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  #1  
Old 09-15-2011, 12:26 PM
xdoc xdoc is offline
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Mein Auto: x5 35d
Question New 35d with strange noise

I purchased a new 2011 X5 35d about 2 months ago. Enjoying it except for one problem. There is a noise which varies from warbling to whining which comes from somewhere in the front of the vehicle when it is moving. It seems to develop around 1300-1500 rpm as it accelerates and increases to a steady loud whine above 1800-2000 rpm. The noise increases as you apply throttle to accelerate or climb a hill. It goes away immediately when you release the throttle. Revving the engine in neutral or park does not create the noise.

The noise has been present since delivery and seems to be getting a little louder. I have 3600 miles on the vehicle. I use Shell 45 cetane. That's the highest I can find in my area.

My thoughts for possible source of the noise are:

Drivetrain noise: It sounds like a worn differential bearing but would not expect this in a new vehicle.
Exhaust line vibration
Engine or transmission mounts: I understand the 35d has pneumatic mounts which vary the firmness based on engine speed. Perhaps a defective mount is causing the noise.

I doubt this would be a belt/pulley or vacuum leak problem if I can't reproduce the noise when the vehicle is stationary. Any other ideas?

Will be taking the X in for service soon. Just trying to get ideas for a cause in anticipation for being told "It's normal, they all do that".
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  #2  
Old 09-15-2011, 01:01 PM
TJS///M3 TJS///M3 is offline
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Location: CT
 
Join Date: Sep 2004
Posts: 382
Mein Auto: 05M3 ZCP / 12 X5
Just throwing it out there.. but I assume you've seen this thread?

http://www.bimmerfest.com/forums/sho...d.php?t=486008

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  #3  
Old 09-15-2011, 02:47 PM
xdoc xdoc is offline
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Location: USA
 
Join Date: Sep 2011
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Mein Auto: x5 35d
Thanks,
Yes, I've seen that thread. Don't know if fuel pump whine has been a problem with the diesels. I would think you'd hear alternator and pump whine when you rev the engine in neutral. I only hear this noise when the vehicle is moving and the drivetrain is under a load.
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  #4  
Old 09-15-2011, 06:50 PM
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hugh1850 hugh1850 is offline
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Quote:
Originally Posted by xdoc View Post
I purchased a new 2011 X5 35d about 2 months ago. Enjoying it except for one problem. There is a noise which varies from warbling to whining which comes from somewhere in the front of the vehicle when it is moving. It seems to develop around 1300-1500 rpm as it accelerates and increases to a steady loud whine above 1800-2000 rpm. The noise increases as you apply throttle to accelerate or climb a hill. It goes away immediately when you release the throttle. Revving the engine in neutral or park does not create the noise.

The noise has been present since delivery and seems to be getting a little louder. I have 3600 miles on the vehicle. I use Shell 45 cetane. That's the highest I can find in my area.

My thoughts for possible source of the noise are:

Drivetrain noise: It sounds like a worn differential bearing but would not expect this in a new vehicle.
Exhaust line vibration
Engine or transmission mounts: I understand the 35d has pneumatic mounts which vary the firmness based on engine speed. Perhaps a defective mount is causing the noise.

I doubt this would be a belt/pulley or vacuum leak problem if I can't reproduce the noise when the vehicle is stationary. Any other ideas?

Will be taking the X in for service soon. Just trying to get ideas for a cause in anticipation for being told "It's normal, they all do that".
I had a problem very similar to what you are describing. The dealer found a broken ground strap getting wrapped up in the drivetrain. I can probably find the paperwork for the repair if you are interested.
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