Inexplicable Vibrations at ~70mph - Mercedes-Benz Forum
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post #1 of 38 (permalink) Old 01-16-2016, 01:31 AM Thread Starter
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Inexplicable Vibrations at ~70mph

The car is in almost perfect condition.

Almost.

A vibration is plaguing the driving experience. Between 60 and 75mph the vibration is most pronounced, but it rears its ugly face at other speeds as well.

Sometimes the vibration seems to (briefly) go away entirely, while other times it's really bad.

When acceleration hard above 70mph it likes to rear its head, but also when coasting or maintaining speed. It's not dependent on engine speed.

I feel it on the throttle pedal and see it on the passenger headrest.

I don't feel the vibration in the steering wheel at all.

The back tires are new contis, the front tires are older somethings.

I've had 3 balances done, and had a wheel "straightened". I've also done an alignment. I've also replaced the rear flex disk. The disease persists.

Googling yields so many forum posts describing exactly this: vibration at 70mph seen in the passenger headrest, and inevitably everyone suggests everything, and OP invariably tries everything, but rarely does something helpful come out.


WHY IS MY CAR VIBRATING?!?!?!!??!!!
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post #2 of 38 (permalink) Old 01-16-2016, 02:19 AM
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Have you checked your centre support bearing.
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post #3 of 38 (permalink) Old 01-16-2016, 02:37 AM
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as I said at mbworld :
Engine mounts , Tranny mounts , wheels and tires . It's one of those but we don't know which .

I like to tackle these in terms of least cost - if you gave another set of wheels or a friend with the same car , first swap tires and wheels , recheck . $20
If you don't have access to another set , rotate your tires and wheels , $20.
Or go to a custom wheel shop that deals in a lot of mb and see if they have an extra set

Not fixed? change tranny mount , $100

Not fixed ? Change engine mounts .
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post #4 of 38 (permalink) Old 01-16-2016, 02:37 AM Thread Starter
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Originally Posted by mattml430 View Post
Have you checked your centre support bearing.
I haven't; is there a way to diagnose this while driving, and what should I look for when I have the car raised?
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post #5 of 38 (permalink) Old 01-16-2016, 02:40 AM Thread Starter
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Originally Posted by tusabes View Post
as I said at mbworld :
Engine mounts , Tranny mounts , wheels and tires . It's one of those but we don't know which .

I like to tackle these in terms of least cost - if you gave another set of wheels or a friend with the same car , first swap tires and wheels , recheck . $20
If you don't have access to another set , rotate your tires and wheels , $20.
Or go to a custom wheel shop that deals in a lot of mb and see if they have an extra set

Not fixed? change tranny mount , $100

Not fixed ? Change engine mounts .
Already changed the transmission and engine mounts. I've considered temporarily switching the front and rear wheels to see if the characteristics of the vibration changes.
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post #6 of 38 (permalink) Old 01-16-2016, 02:58 AM
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https://www.benzworld.org/forums/atta...ve-shaft-1.jpg

this may not be the same as yours but just to give you the general idea.
Part no. 7

Last edited by mattml430; 01-16-2016 at 03:00 AM.
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post #7 of 38 (permalink) Old 01-16-2016, 03:05 AM Thread Starter
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https://www.benzworld.org/forums/atta...ve-shaft-1.jpg

this may not be the same as yours but just to give you the general idea.
Part no. 7
I know the part. It's $30 for Vaico, and $120 for OEM mercedes from ECS.

Is there an easy way to test this part? Feel the drive shaft for play? I don't feel any vibration in the shifter where I would expect to feel something.

Another part I've considered checking is the differential bushings.
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post #8 of 38 (permalink) Old 01-16-2016, 03:11 AM
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I know the part. It's $30 for Vaico, and $120 for OEM mercedes from ECS.

Is there an easy way to test this part? Feel the drive shaft for play? I don't feel any vibration in the shifter where I would expect to feel something.

Another part I've considered checking is the differential bushings.
There will be a small amount of movement in the rubber but the bearing should have none. Hop under there and give it a good wobble and see how much movement it has.
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post #9 of 38 (permalink) Old 01-16-2016, 06:22 AM
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I have a 2000 W202. I also had problems with vibrations at highway speeds. For years I took it to a local Firestone dealer who sold me a lifetime alignment. I was never satisfied.

Eventually an employee at Firestone informed me of Mercedes' use of eccentric bolts and washers for alignment of their cars. It is a process only the dealerships are truly prepared for.

I have since begin taking my car to the local dealership for alignments, and have been happy ever since. No more vibrations at highway speeds.
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post #10 of 38 (permalink) Old 01-16-2016, 08:18 AM
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search my nick on both forums for my comments on the forward mounts of the rear axle suspension table. The forward ones are hard to inspect, and if gone allow the diff to shift up and down with accell/decell.
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