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Hyundai Sonata Front Suspension "Thunk"

dncbdncb Posts: 70
edited December 2013 in Hyundai
I've begun this Discussion topic since the thump/clunk issue relating to the Sonata suspension has been largely addressed in these forums as relating only to the rear suspension of 2006 models and a few early 2007s. However, it also seems to be appearing in the front and/or rear suspension of 2007 models - namely in mine.
I have a Limited- manufacture date Aug 2006 which has the "thunk" largely in the right front, but exists to a lesser degree at all three other suspension positions. So far, I have examined on my own (since Horne Hyundai in Apache Junction AZ said, "We can't hear anything.") the lower control arm strut bushing (as advised in other posts for clunking Azera's) without seeing any visible space as the writer of that post did in his. Next I plan to retorque the upper strut mounts to factory torque and will report my findings. Since the problem is easily reproducable on certain bumps on which I travel almost daily I plan to ask the dealer mechanic to ride with me while I drive over those areas instead of simply dropping the car off at the dealer as I did last time.
In the mean time I'd like to open this up for anyone else who has experienced the "thunk" in front positions (or rear positions if it also occurred in the front and both were fixed, or you have information which might relate to front suspensions) for 2007 models. As others have reported, when we have evidence that this is not an isolated incident then we have a much better chance of getting Hyundai to address it as an issue. Thanks for your input.


  • comet64comet64 Posts: 12
    I had the rear "thunk", and had it fixed. After the rear was fixed, my attention was directed to the right front suspension issue as discribed in the earlier post. I'm just confirming that I also have the exact problem. I have not yet addressed it to the dealer. My vehicle is a 2007 limited with the ultimate package.
  • tmporttmport Posts: 19
    Is the assumption that this is a problem for the V6 models only, as with the rear "thunk"?
  • dncbdncb Posts: 70
    In response to my first post concerning the possible involvment of the front strut (shocks) mounts: I retorqued the mounts (the center mounting stud with the rubber bushing under it) without effect on the thunking problem. The outer three nuts were already tight.

    In response to "comet64": regarding your rear thunk that was fixed. Do you know what they did to fix the problem? Did they replace the shock portion of the strut with different ones, or just tighten something? If you do not know, could you possibly find out? Thanks in advance.

    FYI: My "thunk" problem is able to be demonstrated every time on a road indentation (or weries of them)like a pothole that still has pavement in it, or a smooth manhole cover that has not been leveled to the road surface well. Holes which are severe also cause tire and body noise which tends to mask the "thunking" to some extent. I recently had occasion to drive on a road that was a solid city block just full of temporary paving and patches due to a utility construction project. It constantly "thunkity thunked" all the way down the block. It sounded like a 10 year-old car with worn out ball joints rather than a new car with only 3000 miles on it. Unfortunately it is a long way from a dealer.
    My next project is to find a street that will produce the "thunking" near a dealer.
  • dncbdncb Posts: 70
    Hmmm..... I can only tell you that mine IS a V6 and also the other writer's. Obviously, we would like to hear from all "thunkers" regardless of engine.
  • comet64comet64 Posts: 12
    The "fix" was a replacement of something. I believe it was the entire strut, but it could have been just different mounting assemblies. I know that they checked their inventory to insure that they had a couple "kits" in stock before I scheduled an appointment, so it involved more than just a tightening type of procedure.
  • dncbdncb Posts: 70
    Thank you for the info. I'll print it and take it with me to the dealer. I have an appointment for April 18 to take a mechanic for a ride to the road places which faithfully produce the noise. I'll report results for everyone.
  • I agree. I have a 2006 Sonata LX & the rear shocks were replaced. It helped but I feel that the front suspension needs correction also. As you say too much thunkity thunk over wash board type surface roads. I'm going to bring it up next time I go for service. As you say, you have to find the right kind of road to demonstrate or you're going to get the "sounds normal" response.
  • dncbdncb Posts: 70
    Well, I'm thorouly disappointed now. I took a mechanic for a ride over the bumps that make the thunk -- one of which does it three times in a row. His response? "Sounds like normal suspension noise to me." I was tempted to ask what kind of car he owned, but restrained myself. Perhaps he is used to driving a piece of junk that thunks and rattles over bumps and thinks that is normal behavior. Ok, I'm ranting now. I should have bought a Toyota.
  • craigbrookscraigbrooks Posts: 420
    No, you should have asked what he drove and if he thinks that noise is ok in his car. This thunk IS NORMAL suspension noise UNTIL THEY fix it.

    Is there another dealer near you or one that has performed the fix that you are aware of? I'm sure you wouldn't mind driving a ways to get this fixed. Correct?
  • ctc1ctc1 Posts: 66
    Have you tried these and do they help?
  • ergsumergsum Posts: 139
    I have had no noise issues with my 2006 GLS V6 with 17" rims (18,400 miles). I just happen to spot these online. They appear to block the gap at the rear of the front fenders and should help filter out some sound propagation into the cabin through the doors.

    By the way, after years with Nissan products (4 vehicles total), I was so impressed with Hyundai's new product line, we have now added a 2007 Santa Fe Limited for the wife to drive.
  • dncbdncb Posts: 70
    No, You bet I wouldn't mind driving anywhere in the Phoenix area to get this fixed. I'd planned to do as you suggest - call around to other dealers to see who has done the fix. It's a little hard to get the time with my job. But I will persue it.
    I'm a little surprised at the lack of others coming forward with similar problems. In a way that is encouraging? Perhaps just an adjustment rather than a defect with the parts??? I hope.
    I was just a little dumfounded that a mechanic would say such a thing.
  • altazeraaltazera Posts: 51
    denial is the normal response of a dealer/mechanic.

    I suspect the problem is related to faulty struts as it occurs in a sign number of Azeras and sonatas. i found several under-torqued bolts in the right front suspension of my azera but the "thunk" "clunk" "rattle" doesn't go away.

    I drove my mother's 1998 Plymouth Breeze today, and it was pleasure to drive around town without having to avoid every single road imperfection. I hope someone comes up with a solution soon. :sick:

    The local dealer has a 2006 Azera that they can't sell because of front suspension noises! :confuse:
  • dncbdncb Posts: 70
    I've found a Hyundai dealer in the Phoenix area who indicates that they have done the rear thunk fix on some 2006's. It is a start. I have delayed getting this taken care of due to the demands of my business. While procrastinating I've noticed the car getting less picky about which bumps it thunks over (not to mention the seatback creak getting louder). Soon, even the most willfully hearing impaired mechanic will be forced to admit it.
  • dncbdncb Posts: 70
    It has been quite a while since talking about the suspension thunking on my 2007 Sonata LTD. I do have a business to run. I decided to sit on it a while and wee what happened. It has slowly gotten worse. I finally decided to take it to another dealer after checking out an bumpy area close to the dealer. They gave me a loaner car, which I took to the bumpy area on the way out. It made the same noise! I called the dealer and left a message to that effect. They took my car for a ride and called me later to tell me that they DID hear the noise, took another car of theirs to that spot and it did it too. They then called Hyundai to find out what they wanted to do. Their response?? Nothing -- unless a LOT more people complain.
    So, three out of three Sonata's make thunking noises on filled pot hole type bumps and Hyundai wants to ignore it. I guess I've got my answer about what good that big warranty is. Nothing at all. Just denial. I should have gotten a Toyota.
  • my local dealer replaced the entire strut assembly, and voila... problem solved. Now I have a nice car.
  • dncbdncb Posts: 70
    Please tell me the history on your problem. My thunking problem is only getting worse such that almost any bump now causes that thunking - front and rear, but mostly front. I would like to also know what dealer fixed your problem (with phone # if you have it) so that I can take that to my dealer. Thanks.
    (All this aside from creaking seat backs (the headrest support posts - inside the seat))
  • "I should have gotten a Toyota" yeah, you should have and faced a whole new set of problems....see Consumer Reports Dec 2007 issue page 6. It seems that Toyota quality MAY be beginning a slide, oh no!!! now what car can we say we "should of could of" bought instead of Hyundai? Honda maybe?
  • Just got a 2008 Sonata a month ago. The thunking wasn't too bad at first, but getting worse. I only have 1200 miles on the thing. Started in the front right, but sometimes I think I here it elsewhere. Haven't had time to get it back there yet. Hope what I'm reading isn't what I'm in for. Oh and by the way, It's only a four cyl, so there goes your V6 idea.
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