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ROUGH & VIBRATION OVER 65 MPH ON 2014 S550

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Old Jan 11, 2023 | 09:55 PM
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Exclamation ROUGH & VIBRATION OVER 65 MPH ON 2014 S550

Hello- I just purchased two days ago (from an MB Dealer in Maryland) a 2014 S550 with 57k miles on it. Very clean one-owner car. Well, my first mistake was that on my test drive I did not take it on i95 and test at speeds above 60MPH. Below 60MPH, the car is a dream, as speed incrementally increases above 60MPH a slight roughness and vibration develops. Above 70 MPH it has a much slower response to acceleration. Please let me know any thoughts you might have that could be causing and what to do to fix? Thank You!
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Old Jan 12, 2023 | 08:22 PM
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try resetting ecu/tcu adaptations...
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Old Jan 12, 2023 | 10:05 PM
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You should have a 30 day (possibly 90 day warranty) if you had purchased from a dealer, so I would get back in there ASAP. Has the check engine light come on?
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Old Jan 12, 2023 | 11:21 PM
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Originally Posted by Bruno158
Hello- I just purchased two days ago (from an MB Dealer in Maryland) a 2014 S550 with 57k miles on it. Very clean one-owner car. Well, my first mistake was that on my test drive I did not take it on i95 and test at speeds above 60MPH. Below 60MPH, the car is a dream, as speed incrementally increases above 60MPH a slight roughness and vibration develops. Above 70 MPH it has a much slower response to acceleration. Please let me know any thoughts you might have that could be causing and what to do to fix? Thank You!
rebalancing all 4 tires.
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Old Jan 13, 2023 | 06:13 AM
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Does it have 20” wheels? If so, my money is on bent wheels. Ask me how I know.
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Old Jan 14, 2023 | 09:19 AM
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Another possibility is the tires are flat spotted if it was sitting for a very long time.
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Old Jan 14, 2023 | 01:03 PM
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MY 18 S450V RWD Diamond White
Best check for bent or cracked rims.
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Old Jan 15, 2023 | 01:17 AM
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Originally Posted by Bruno158
Hello- I just purchased two days ago (from an MB Dealer in Maryland) a 2014 S550 with 57k miles on it. Very clean one-owner car. Well, my first mistake was that on my test drive I did not take it on i95 and test at speeds above 60MPH. Below 60MPH, the car is a dream, as speed incrementally increases above 60MPH a slight roughness and vibration develops. Above 70 MPH it has a much slower response to acceleration. Please let me know any thoughts you might have that could be causing and what to do to fix? Thank You!
What did you pay and what options did it come with?

Did you try road force balancing the tires?
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Old Jan 15, 2023 | 02:04 AM
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Originally Posted by Sactownmb
Best check for bent or cracked rims.
Agree completely and before you spend a bunch of money, make sure you don’t have bent rims. A bent rim can be balanced but it can still vibrate like hell.

A wheel, brake, alignment or tire shop with an excellent reputation can get you started.
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Old Jan 15, 2023 | 12:38 PM
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It’s wheels and tires. I would have all 4 road force balanced and that will tell you if it has bent rims or needs new tires.
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Old Jan 15, 2023 | 02:08 PM
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Originally Posted by Nice Ride
What did you pay and what options did it come with?

Did you try road force balancing the tires?
Dont want to shift topics... but I had tires replaced at a Texas state wide chain and ask for Road force balancing... they told me they would only do it if they experience customer complaints after normal balancing...

I asked if they would do it anyway
Never did get a clear response

Fortunately the car rolls extremely well and smooth Already so I don't know if I actually received one...dont think i did... but i was puzzled at the reluctance...
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Old Jan 15, 2023 | 02:41 PM
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Originally Posted by kafklatsch
Dont want to shift topics... but I had tires replaced at a Texas state wide chain and ask for Road force balancing... they told me they would only do it if they experience customer complaints after normal balancing...

I asked if they would do it anyway
Never did get a clear response

Fortunately the car rolls extremely well and smooth Already so I don't know if I actually received one...dont think i did... but i was puzzled at the reluctance...
It takes a lot of extra effort / time to do proper Road Force balancing. Although I am sure they charge more for it, it still probably isn’t worth their time. That being said, I believe it makes a big difference for those us who drive fast (100+mph).
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Old Jan 15, 2023 | 03:01 PM
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Originally Posted by kafklatsch
Dont want to shift topics... but I had tires replaced at a Texas state wide chain and ask for Road force balancing... they told me they would only do it if they experience customer complaints after normal balancing...

I asked if they would do it anyway
Never did get a clear response

Fortunately the car rolls extremely well and smooth Already so I don't know if I actually received one...dont think i did... but i was puzzled at the reluctance...
Never buy tires there again. Lazy ****s.

Expect to pay more for Road Force balancing, that I have no problem with.
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Old Jan 15, 2023 | 04:40 PM
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Originally Posted by SW20S
It’s wheels and tires. I would have all 4 road force balanced and that will tell you if it has bent rims or needs new tires.
Yes, but before you road balance the wheels and tires, drive the car for at least 1 hour at 50+ MPH to put a heat cycle into the tires and get rid of any flat-spotting the rubber took on while sitting for months.

If you balancing before this, they will need another after a couple of heat cycles.
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Old Jan 15, 2023 | 06:10 PM
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Originally Posted by Bruno158
Hello- I just purchased two days ago (from an MB Dealer in Maryland) a 2014 S550 with 57k miles on it. Very clean one-owner car. Well, my first mistake was that on my test drive I did not take it on i95 and test at speeds above 60MPH. Below 60MPH, the car is a dream, as speed incrementally increases above 60MPH a slight roughness and vibration develops. Above 70 MPH it has a much slower response to acceleration. Please let me know any thoughts you might have that could be causing and what to do to fix? Thank You!
As all here are suggesting, a Roadforce balance is a good start. Just make sure the Tech is not a rookie which some are. Make sure they include with the balance a test for the tire and wheel each for being out of round. A smooth ride analysis is impossible without passing grades for these tests.

And at 8 years old, an S without a bent wheel is unlikely. Good luck.
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Old Jan 16, 2023 | 08:57 AM
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Locate: https://www.hunter.com/wheel-balance...d-force-elite/
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