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Hyundai Sonata Rear Thump

183 messages,  Last post on Aug 20, 2007 at 9:36 AM

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What is this discussion about? Hyundai Sonata, Suspension, Sedan


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#2 of 183
Rear body/chassis thumping by silverfox1
Dec 01, 2005 (6:03 pm)
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Have a 06 Sonata LX. Chasing above average rear body/ chassis thumping when going over a bump or step in the pavement. Have relocated the spare and tighten the holding mount. Re adjusted the two trunk stops. Securing the spare helped but still have some thumping. Is it possible that some added padding to the trunk floor will help? Anyone have the same problem and a solution?
#3 of 183
Re: Rear body/chassis thumping [silverfox1] by stockmanjoe
Dec 02, 2005 (3:31 pm)
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Replying to: silverfox1 (Dec 01, 2005 6:03 pm)

Silverfox1:
 
     I have a 2006 Sonata GLS 4 cyl. I hear a slight knock or bang (I think coming from the undercarriage) often times when I first accelerate. Does anyone else have this?
#4 of 183
Re: Rear body/chassis thumping [stockmanjoe] by tb88
Dec 03, 2005 (7:05 am)
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Replying to: stockmanjoe (Dec 02, 2005 3:31 pm)

May be it's the fuel used causing knocks!
Switching to a different gas station / higher octane may solve the problem... Old gas stations sometimes have storage tank problems (water/contamination...).
I always try to get Gas at the newest gas station around.
I also read, that some new 4cyl cars require Premium (i think i read that in a Civic Si review!!
#5 of 183
Re: Rear body/chassis thumping [stockmanjoe] by silverfox1
Dec 03, 2005 (12:34 pm)
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Replying to: stockmanjoe (Dec 02, 2005 3:31 pm)

No problems with noise from chassis or body on take off. Thumping occurs when driving on bumpy roads. Car is very quite on smooth roads. 17" tires do not help the thumping issue since they have very little give to them. I think added insulation and better quality bushings between the chassis and body would help. Anyone out there have any thoughts on this problem?
#6 of 183
Re: Rear body/chassis thumping [tb88] by stockmanjoe
Dec 05, 2005 (2:31 pm)
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Replying to: tb88 (Dec 03, 2005 7:05 am)

Thanks tb88 for the reply. Don't tell me that - last thing I need to do is buy premium gas. Hopefully it will stop.
#7 of 183
Re: Rear body/chassis thumping [silverfox1] by hmma007
Dec 09, 2005 (8:24 pm)
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Replying to: silverfox1 (Dec 01, 2005 6:03 pm)

Hi Silverfox, is the noise definately coming from the spare tire well or is it from one of the rear wheel wells? Just curious,
#8 of 183
Re: Rear body/chassis thumping [hmma007] by silverfox1
Dec 10, 2005 (9:06 am)
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Replying to: hmma007 (Dec 09, 2005 8:24 pm)

Sounds seems to come from the lower trunk area which makes me think the suspension is not isolated enough from the lower body. Car is so quiet on smooth pavement any noise is offensive. Will review issue with dealer some time in the future. Do you have a similar condition?
#9 of 183
Re: Rear body/chassis thumping [silverfox1] by cxc
Dec 13, 2005 (9:51 am)
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Replying to: silverfox1 (Dec 10, 2005 9:06 am)

I noticed similar condition for my 06 Sonata LX. It turned out that the fold down rear seats were not locked as the car came out the factory. After locking the rear seats from trunk, I did not hear any abnormal sounds from the rear. I hope this will help.
#10 of 183
Re: Rear body/chassis thumping [cxc] by silverfox1
Dec 13, 2005 (5:08 pm)
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Replying to: cxc (Dec 13, 2005 9:51 am)

Thanks for that info, will check that out in the morning. I been playing mind games trying to figure out what and where it is coming from. I was thinking of the exhaust system as it seems more pronounced when the car is cold but may be my imagination.

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