Resolution to flutter at 25-30 mph

[TinsleyC]

As others have said, it's likely the rubber in the axle u-joint that gets hard in cool weather. If it's not "straight" when it cools, it hardens into a warped position and creates the wobble you feel. As it warms up, it loosens and becomes flexible.

 

[phdegraff]

As others have said, it's likely the rubber in the axle u-joint that gets hard in cool weather. If it's not "straight" when it cools, it hardens into a warped position and creates the wobble you feel. As it warms up, it loosens and becomes flexible.

 

[phdegraff]

Thank you, Mr. Tinsley! I agree with your diagnosis except it doesn't seem that cold affects it that much. I get the vibration in the summer, sometimes worse than I get it now. My driving is done in Connecticut.
I just wish the company would get serious and fix it.
My only other complaint with this car is that virtually no heat is directed fully downward toward my feet. That's been realllly annoying this winter.

 

[TinsleyC]

Okay. I've heard others say it's worse when it's cold out. But it does kinda make sense.

When the car is in drive or reverse, there is torque being applied to the drive shaft. Maybe try this a few times and see if it makes a difference. 1) Pressing the brake, put the car in Neutral. 2) Set the parking brake 3) Put it in Park. 4) Turn the car off. The idea is to remove the stress from the driveshaft and see if it affects the "wobble" the next day. This is not a new idea, others have tried it but I don't recall the outcome. I think one did say it helped, which helps prove the theory.

If you use the selector on the dashboard to direct all air to the downward vents, do you not feel it then?

 

[phdegraff]

Okay. I've heard others say it's worse when it's cold out. But it does kinda make sense.

When the car is in drive or reverse, there is torque being applied to the drive shaft. Maybe try this a few times and see if it makes a difference. 1) Pressing the brake, put the car in Neutral. 2) Set the parking brake 3) Put it in Park. 4) Turn the car off. The idea is to remove the stress from the driveshaft and see if it affects the "wobble" the next day. This is not a new idea, others have tried it but I don't recall the outcome. I think one did say it helped, which helps prove the theory.

If you use the selector on the dashboard to direct all air to the downward vents, do you not feel it then?

I'm not sure. This vibration subject has been bouncing around on this site for at least two years. Your parking procedure makes sense and I have tried it, but then other worldly concerns made me forget about it. I only remember that if it made a difference it was slight, still hard to judge. Has it or anything worked for you?

Yes, heat selected to direct downwards gives NO heat the my feet although a little bit seems to come from under the dash. If you look at the illustration in the manual, it shows nice, pretty white arrows of air coming from all the outlets except from under the dash, where the arrows are grey. If I were younger I'd slip under the dash on my back with a flashlight and find a way to get heat where I want it, but I'm 89 years old and, although slim, I'm just not that flexible anymore. The dealer looked into it, said they fixed it, charged me $78, but I am sorry to say NO JOY! My feet are still cold. I see you're in Dallas so, by my decision, you are not qualified to judge this one. (**GRIN** - just teasin')

 

[mjourney]

I have the same "fluttering" sound between 20-30 mph after a cold start; no vibration at all, just the fluttering sound. I've had two different Hyundai dealerships address the issue. Both dealerships "CLAIM" they could not replicate the sound. I even took the car in the day before my scheduled appointment so they could do a cold start the next morning. All I can think now is that these Genesis technicians are DEAF because it happens EVERY SINGLE TIME I start the car after it's been sitting for a while. Like others in this forum, I'm now sort of afraid to take in again.

 

[phdegraff]

There are two strings on this subject on this site: One is "Vibration at 30mph", the other is "Resolution to flutter at 25-30 mph".
The former has two pages of entries, the latter, 7. The first entry of the latter (Jan 1, 2020) says he started a new thread because the old one had too many entries. (Yes, we or the site manager should have combined all of these but it hasn't happened.)
What I can glean from all the entries is that this vibration/flutter happens, broadly speaking, between 28 and 35 miles per hour on AWD Gennies only, especially those in the 2015 to 2018 model years.
Attempts to correct the problem have ranged from installing new tires, straightening bent wheels(!), to adjusting drive train components, to completely replacing drive train components, including the transmission and transfer case.
No one has reported a complete, lasting solution, nor, to my knowledge, has anyone reported that they talked to a factory representative.
I could be wrong about any of the above and, if I am, please state your case, especially about any feedback of any sort from the factory. I have sincere doubts that after all this there will be a solution, but who knows?
Who is next?
Pete

 

[sel]

The suggestion to get the wheels off the ground and run it up to 30-ish mph is a great idea, but that could be done by a dealer in moments with a frame-lifting hoist. Can we get a dealer interested enough to do it? Can we try it at a "corner" gas station that has the right kind of lift?
I have reservations about doing only the rear wheels off the ground with an AWD car like mine. Also, as TinsleyC said, the problem may not show up with no load on the drive train - except that mine vibrates even coasting in neutral - right at its favorite 32mph "spot". Gotta wonder.
Is Hyundai listening in case we actually solve their problem???

Did the test at a dealership while they changed the propeller shaft. It vibrated while on the hoist...
The said its the tires, I
Changed tires, differential fluids, brakes, discs, calipers. Problem still existing.

 

[arcman]

So sad to see how these dealers pass the buck on this. Lots of excuses.

Read this post: Say Goodbye to the Flat Spotted Tires / Shuttering Theory

Go back to the dealer and have them put it up on the lift again. Remove the wheels and run it up to 30mph and see how much it shakes. Then disconnect the rear driveshaft at the trans and run it up to speed again. Vibration will be gone.

Was it the dealer who recommended/changed the calipers? Couldn't possibly have an affect on vibration.

 

[CVue]

What was the resolution?

______________________________

Help support this site so it can continue supporting you!

 

[Gahaha]

What was the resolution?

I don't think there is a permanent one, just gotta live with it, it is only 10 min when cold at low speeds anyway.

 

[BillZ]

I don't think there is a permanent one, just gotta live with it, it is only 10 min when cold at low speeds anyway.

I still believe your description indicates a flat-spotting issue with one of your tires.

 

[Gahaha]

I still believe your description indicates a flat-spotting issue with one of your tires.

Its not, its an inherent issue with the car, something with the driveline or similar. I have 104k on the odometer and have gone through 3 sets of tires. Car does not sit long enough for flat spotting to occur.

 

[phdegraff]

I still believe your description indicates a flat-spotting issue with one of your tires.

It's been argued and proven here time and time again: It is NOT tires in any way - balance, flat spotting or anything. Do I see BillZ that your genny is a 2021? I have to assume you do not have the problem.
The problem is a fairly high frequency vibration, well above the sound of a tire w/a flat spot. It's a thrumming sound (and feeling through the seat), at 30 to 35mph. It goes away after driving for ten to twenty minutes.
But I have asked here several times if anyone with a Genny newer than 2017 has experienced the problem. I believe the answer is no but we haven't had much response to the question. Also, it seems to be limited to AWD models AND it has, from the postings here, never been solved.
Does anyone have experience that counters what I just wrote????

 

[Gahaha]

It's been argued and proven here time and time again: It is NOT tires in any way - balance, flat spotting or anything. Do I see BillZ that your genny is a 2021? I have to assume you do not have the problem.
The problem is a fairly high frequency vibration, well above the sound of a tire w/a flat spot. It's a thrumming sound (and feeling through the seat), at 30 to 35mph. It goes away after driving for ten to twenty minutes.
But I have asked here several times if anyone with a Genny newer than 2017 has experienced the problem. I believe the answer is no but we haven't had much response to the question. Also, it seems to be limited to AWD models AND it has, from the postings here, never been solved.
Does anyone have experience that counters what I just wrote????

Mine is the 2015 5.0 RWD and I've had the issue since I got the car, its very slight and not as loud when it is warm.

 

[phdegraff]

Mine is the 2015 5.0 RWD and I've had the issue since I got the car, its very slight and not as loud when it is warm.

Fascinating! You just broke the pattern *I thought* governed this thing. Yours is *not* all wheel drive, yet you have the issue. All right now, men: REGROUP!
(I wish I had something more constructive to say.....)

 

[Gahaha]

Fascinating! You just broke the pattern *I thought* governed this thing. Yours is *not* all wheel drive, yet you have the issue. All right now, men: REGROUP!
(I wish I had something more constructive to say.....)

I have a c7 z06 that has the same issue lol, fluttering/ticking noise when cold too, at this point I am convinced it is by design and have learned to live with it. I have 13k miles on the z06.

 

[phdegraff]

I have a c7 z06 that has the same issue lol, fluttering/ticking noise when cold too, at this point I am convinced it is by design and have learned to live with it. I have 13k miles on the z06.

Tough car! but why would that have a similar problem? (I had a '57 Vette. In fact I courted my bride in it. We've been married 61 years now...)
ANYway, I haven't heard a ticking noise mention with the Genny, but the damned vibration *AND* no heat (or very very little) to the feet really have me disheartened. I hope they've fixed both by the next time I trade (if I live that long). The vibration? *I* am convinced it's a flex coupling that gets a "set" after sitting, *somewhere* in the drive train.

 

[Kraig Wilkinson]

Its not, its an inherent issue with the car, something with the driveline or similar. I have 104k on the odometer and have gone through 3 sets of tires. Car does not sit long enough for flat spotting to occur.

Flat spotting can occur overnight. Heavy Car .....low profile tire.

 

[Gahaha]

Flat spotting can occur overnight. Heavy Car .....low profile tire.

Noise occurs on throttle only at low speeds, its not the tires.