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Rumbling noise/frequency?

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Old Jul 18, 2017 | 05:48 PM
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2018 C350Te Wagon
Rumbling noise/frequency?

Mostly noticeable from 60 mph and above, and it can't be tires. 2 second cycle where this rumbling acoustic. And I feel that the consumption is high. At this speed, 0.9—1 liter pr 10 km. 2 adults and 2 children on boarding.
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Old Jul 18, 2017 | 07:14 PM
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Could it be a polar bear....?
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Old Jul 18, 2017 | 07:17 PM
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Why can't it be tires?

Check mounts, driveshaft bushings, etc. Gotta be something driveline related if it "can't be tires" even though, it's normally tires.
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Old Jul 19, 2017 | 12:55 AM
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Originally Posted by ItalianJoe1
Why can't it be tires?

Check mounts, driveshaft bushings, etc. Gotta be something driveline related if it "can't be tires" even though, it's normally tires.
Tires don't behave like that, then the frequency would be more stable not going up and down at the same speed.
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Old Jul 19, 2017 | 03:39 AM
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Try recording it for a better understanding here.
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Old Jul 19, 2017 | 06:19 AM
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Originally Posted by CFG
Could it be a polar bear....?
I also believe it could be a polar bear... or at least a wet fart
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Old Jul 19, 2017 | 11:48 AM
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Originally Posted by Thlian
Tires don't behave like that, then the frequency would be more stable not going up and down at the same speed.
I don't think that's true, necessarily.
A noise that appears at a certain speed and then disappears could be a harmonic.
Harmonic noises can be translated to the vehicle and our ears, in different ways.
In fact, they can often be "thrown" from the originating location to a new location unrelated to the noise - fooling us.

That being said, if the tires have uneven wear or pressure, it could account for your description.
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Old Jul 19, 2017 | 05:16 PM
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It can't be records. It's not noticeable by pasienters, but I can can feel it through the seat at styring wheel as a wrooooom-----------wroooooom kinda feeling. Small vibrations that comes a second apart. Condition of road does not matter, Im kinda concentrated above 80, but still. Wtf?
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Old Jul 19, 2017 | 05:39 PM
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You're feeling the change in vibration as the intensity increases, not frequency. It's an amplitude fluctuation, as it gets very severe it transmits into the car and dampens, then starts over again. I've had this happen before, it's always driveline or tire related. There is a bulletin on the 166 about turning the driveshaft 1 bolt, just unbolt it and move it to the next bolt holes, then put it back on, to attempt to address this type of thing. At this point, that's the stuff you have to try.

The first step is to swap a set of wheels/tires from another vehicle that doesn't shake though, just to rule them out.
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Old Jul 19, 2017 | 05:45 PM
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Originally Posted by ItalianJoe1
You're feeling the change in vibration as the intensity increases, not frequency. It's an amplitude fluctuation, as it gets very severe it transmits into the car and dampens, then starts over again. I've had this happen before, it's always driveline or tire related. There is a bulletin on the 166 about turning the driveshaft 1 bolt, just unbolt it and move it to the next bolt holes, then put it back on, to attempt to address this type of thing. At this point, that's the stuff you have to try.

The first step is to swap a set of wheels/tires from another vehicle that doesn't shake though, just to rule them out.
Sounds like a dealer issue then, I can always do it by why bother 😉 It has run about 2000 km
​​​​​(my head don't do miles for the time being)
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Old Jul 19, 2017 | 06:52 PM
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Originally Posted by Thlian
It can't be records. It's not noticeable by pasienters, but I can can feel it through the seat at styring wheel as a wrooooom-----------wroooooom kinda feeling. Small vibrations that comes a second apart. Condition of road does not matter, Im kinda concentrated above 80, but still. Wtf?
That Buick Roadmaster is looking pretty good now isn't it?
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Old Jul 19, 2017 | 08:22 PM
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I've had a similar issue when the car had approx 5k km. Was solved after dealer road force balanced the tires and did the alignment.
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Old Jul 19, 2017 | 08:52 PM
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Somewhere in Svalbard....

http://www.nathab.com/polar-bear-tou...FVJefgodUdIOqw

Last edited by removedCFGaccount; Jul 25, 2017 at 07:52 PM.
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