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Discussion Starter · #1 ·
I purchased my car used and my dumb fault for not taking car on highway before purchase (drove at highway speeds on side roads).

While traveling on a freshly paved road on the highway my steering wheel as a vibration. I can visibly see the passenger headrest vibrate back and forth at speeds from 50-80 mph

I understand on non smooth roads this is okay but on freshly paved roads I feel this vibration.

When I take the car into the dealership the don't drive it on the freshly paved roads and only feel the vibration of the road I expect them to feel anything other than smooth.

I had all four tires replaced, balanced and an alignment. Everything supposedly checks out.

It feels like the tire has lump in it or the shock/strut is fluttering.

All I know is that it does not feel smooth on the highway. Holding onto the steering wheel aggravates me now. Not sure if it has something to do with electronic steering?

SO I ask, how smooth is your steering wheel at speeds of 50-80 mph when you are on freshly paved asphalt?
 

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Discussion Starter · #3 ·
I wish I could post a photo of my face as the mechanics said the same thing to me about my car as they test drive it.

All though it is winter weather now and road/air conditions are not in my favor to replicate my feeling
 

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You shouldn't feel anything while you're driving. I can take my hand off the wheel and go straight still. I would do what Gene said and go to another Kia dealer and ask them to look at it, take you with them when they drive it so you can point out when/where it happens. The most you should get at those speeds is a little road noise.
 

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Smooth as butter. After replacing the wheels and tires, had a bit of a problem, took it back to Firestone and they rebalanced and all is fine at all speeds...


Did you get the new tires as soon as you took ownership? could be just a bad balance, or as stated, a bad tire.
 

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Smooth as New Orleans Jazz (on normal freeways and streets); I agree with others try yours on a known smooth highway and then on a more bumpy road.

Balancing and alignment should do the trick but if not check to see if something got damaged underneath. Maybe "the wife" drove over a curb (my excuse for anything I find wrong);)
 

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Discussion Starter · #10 ·
So i made the dealership pass the car off to a another tech. He informed me he thinks its the tires. The Hankook (about 500miles on them) roadforced tested at 3/11/14/14lbs and the quick alignment check laser had the RR camber out of spec a little and both front/rear toe slightly off to the left.

He too the 3/11lb tires and put them up front and the 14lbs on the rear, no adjustment to alignment at this time.

I do feel an improvement just from that change. It did not eliminate the symptoms but did reduce them to a much better tolerable feeling...until I go to rotate tires.

He suggests he can try rotating the tires on the rims and retest to see if a better number can come from the roadforce test or replace tires for some Michelins and realign and eliminate the crappy Hankooks
 

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I dumped the Hankooks as quickly as I could, I would have them replace your tires if they're offering.

It should be smooth as glass.
 

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Discussion Starter · #13 · (Edited)
The original dealership just replaced with OEM tires, after I told them I would pay for the difference of a different brand but..... They suck and just slapped on a new set.

After complaining with days after the new set I took the car and back and long story short they said two tires were defective and gave me a new pair, which they said fell within spec of the raod force balance and therefore gave it back to me.

The new dealership isnt offering to replace them, I will have to buy this set but if it solves the issue I will be happy. Now to choose the correct tire
 

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I put the Bridgestone Turanza Serenity Plus on our cadenza. big difference.
I've been using the Serenity for years now, 3rd set I've driven on, won't drive on anything else. I remember the earlier version of them was just a little softer rubber, so it didn't last long, but man did it grip! The new Plus's are supposed to last longer, and you can tell they aren't as soft when you're really pushing a dry turn. But you wanna talk about quite! and the best wet weather tire I've ever used period.
 

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I'm running the Bridgestone POTENZA RE97AS currently.

They're a little noisier, but I have found they have great grip on the back roads I frequent. TCS used to kick on a lot, now it never does.

I do drive my Cadenza a lot harder than I think most people drive theirs... Its just too much fun! :)
 

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2014 SLX with Hankook tires has had a vibration since the day I received the car in November 2014. I mentioned this to the dealership but they said that they didn't feel the vibration. Then took it to an independent shop and was told the tires were not balanced properly. This did improve the issue but didn't eliminate it completely. I have about 12,000 miles on the car now and am taking the car to the dealership tomorrow for an oil change and tire rotation. I will mention this problem to them again. I find that the Hankook tires get flat spots very easy if the car sits for a while in as little as a few hours. I have never had this problem before with any tire in all my years of driving. Otherwise my Cadenza has been perfect.
 

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2014 SLX with Hankook tires has had a vibration since the day I received the car in November 2014. I mentioned this to the dealership but they said that they didn't feel the vibration. Then took it to an independent shop and was told the tires were not balanced properly. This did improve the issue but didn't eliminate it completely. I have about 12,000 miles on the car now and am taking the car to the dealership tomorrow for an oil change and tire rotation. I will mention this problem to them again. I find that the Hankook tires get flat spots very easy if the car sits for a while in as little as a few hours. I have never had this problem before with any tire in all my years of driving. Otherwise my Cadenza has been perfect.
A flat spot within a few hours? Are you tires properly inflated? I've never had any of these issues. If your tires are that bad then they should probably be replaced as they sound defective. My OEM Hankooks have 15K+ with no problems at all.
 

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Yes it is very aggravating and the only thing I am disappointed with the car. I am going to speak with the dealership when I bring it in for service. Yes the tire pressure is correct on all tires.
 
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