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X3 E83 (2004 - 2010)
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  #1  
Old 11-22-2016, 03:03 PM
hcx3 hcx3 is offline
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06 X3 sounds like sitting in the back of a bus

Hi All - I have an X3 that recently develop a humming sound when step on gas pedal. It's a low frequency sound. It's kind of like sitting in the back of the bus. The car has new tires, and alignment. The noise start at around 45mhp and up. It's worse at 60mhp and 2000 rpm. It's a little better at 65mhp and 2300rmp. At 45mhp and above the noise occurs even with a small force apply on the gas pedal. The noise goes away the moment the foot of the gas pedal. I've check the active exhaust valve and it seem like it's working fine. The engine has about 90k miles and the rest of the car is about 214k. Transfer case, front/rear different oil change about 20k miles ago. Anyone has a similar problem?

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  #2  
Old 11-22-2016, 03:13 PM
BMWaufKS BMWaufKS is online now
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Could be most anything, unfortunately. Can you post a recording?

Some random ideas: Air filter is missing. Engine/transmission mounts. Bad tire. Failing U- or flex joint joint.
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  #3  
Old 11-22-2016, 03:24 PM
hcx3 hcx3 is offline
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Originally Posted by BMWaufKS View Post
Could be most anything, unfortunately. Can you post a recording?

Some random ideas: Air filter is missing. Engine/transmission mounts. Bad tire. Failing U- or flex joint joint.
New engine mounts at 20k miles ago, air filter seems fine. Unfortunately the audio pick up only wind noises.
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  #4  
Old 11-22-2016, 03:33 PM
hcx3 hcx3 is offline
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Originally Posted by hcx3 View Post
New engine mounts at 20k miles ago, air filter seems fine. Unfortunately the audio pick up only wind noises.
Also replaced new rubber hose to active exhaust vacuum reservoir. Does the active exhaust only open when the car in drive or it open at a certain rpm? Could it be stuck closed? When the car start it goes from open to close, when pull the electrical connector to the vacuum switch it stay open.
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  #5  
Old 11-22-2016, 03:48 PM
russella russella is online now
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If the problem wasn't there before you fitted the new tyres I would suggest the tyres aren't balanced properly. I recently had some poorly balanced tyres fitted to my X3, the vibration would start at 40mph, build to a max at 60 then die down again before building again at 80 and getting worse beyond that. Had all tyres rebalanced and vibration went away.
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Old 11-22-2016, 04:40 PM
hcx3 hcx3 is offline
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Originally Posted by russella View Post
If the problem wasn't there before you fitted the new tyres I would suggest the tyres aren't balanced properly. I recently had some poorly balanced tyres fitted to my X3, the vibration would start at 40mph, build to a max at 60 then die down again before building again at 80 and getting worse beyond that. Had all tyres rebalanced and vibration went away.
I will try to have the tires balance again. Did you get a lot of noises or just vibration? I get noises only when step on the gas pedal. Before this, I got alignment and uneven worn out tires, that is why I replace new tires and alignment. After alignment, I got noises after I let go off the gas pedal, but that when away after like 100miles of driving.
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  #7  
Old 11-22-2016, 07:09 PM
dukedkt442 dukedkt442 is offline
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What kind of tires?
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  #8  
Old 11-22-2016, 09:59 PM
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X3-terrestrial X3-terrestrial is offline
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Wheel bearings.
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  #9  
Old 11-22-2016, 10:21 PM
abscate abscate is offline
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Classic noise of rear driveshaft and center bearing carrier.

Too low miles for rear wheel bearings and front wheel bearings won't change noise on float

Tire noise also won't abruptly change on float.

Get underneath, Al cover off,and check for slack in guibo, shafts, carrier bearing, UJ

BMW charges a ridiculous amount for this work so a DIY is the way to go. 2/5 of difficulty scale

Last edited by abscate; 11-23-2016 at 05:09 AM.
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  #10  
Old 11-23-2016, 06:52 AM
hcx3 hcx3 is offline
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Originally Posted by dukedkt442 View Post
What kind of tires?
Nokian Entyre... Shouldn't tires noises be constant and at turns?
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  #11  
Old 11-23-2016, 06:57 AM
hcx3 hcx3 is offline
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Quote:
Originally Posted by X3-terrestrial View Post
Wheel bearings.
I am kind of leaning toward bearings since a small tap on the gas pedal the noises would get louder. Just couldn't figure out which one since it seems like only when there is load on the car. I put the car on lift and try to look for noises at each wheel and the diff, but didn't hear anything unusual, but maybe because no load.
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  #12  
Old 11-23-2016, 07:03 AM
hcx3 hcx3 is offline
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Quote:
Originally Posted by abscate View Post
Classic noise of rear driveshaft and center bearing carrier.

Too low miles for rear wheel bearings and front wheel bearings won't change noise on float

Tire noise also won't abruptly change on float.

Get underneath, Al cover off,and check for slack in guibo, shafts, carrier bearing, UJ

BMW charges a ridiculous amount for this work so a DIY is the way to go. 2/5 of difficulty scale
Agree BMW would charge ridiculous amount for any type of work.

I will check the suggested items. Just annoying to hear noises but can't pin point the problem.
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  #13  
Old 11-23-2016, 04:37 PM
dukedkt442 dukedkt442 is offline
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Was the sound present prior to tires? I thought it appeared with the tires. If not, definitely check out either the shaft or wheel bearings. Other option is the rear differential. After 214k miles, any could be possible.

Any vibrations associated with the noise?
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  #14  
Old 11-23-2016, 07:11 PM
bmwbob89 bmwbob89 is offline
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I just went through this with my 04 X3. It was the rear u joint on the main driveshaft. The only way to know for sure it was seized was to remove the driveshaft. Pulled it out and sure enough the u joint was seized in one direction. Replaced the driveshaft and problem solved. I bought one from PowertrainIndustries.com. It was a little more money than some of the others but great quality with replaceable u joints. I did not want the ones with grease fittings as they can't be accessed with out a lot of work.
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  #15  
Old 11-24-2016, 07:27 AM
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legalfee legalfee is offline
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Quote:
Originally Posted by X3-terrestrial View Post
Wheel bearings.
^^^This^^^I would suspect wheel bearings. Next suspicions would be drive shaft (U joint).
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  #16  
Old 11-24-2016, 08:26 AM
abscate abscate is offline
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Roll underneath and snap a picture of the orange dust in your rear UJ.

Then replace driveshaft, UJ, carrier bearing.

Thank Tom NJ for this quick diagnostic tip posted here.
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