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Automotive Repair


John G. in OK.'s Avatar
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01-22-05, 08:10 AM   #1  
John G. in OK.
Automotive Repair

DIY:

Iím writing to ask your help with a very annoying problem that Iím having with my 2004 Hyundai Sonata. We recently purchased (Dec.) used from a dealer in OKC. OK. We live about 75 miles SW of OKC. And when we test-drove the car, the problem was not noticeable. It soon became apparent as my wife is the main driver; she and my grandson both told me they a were feeling a significant vibrations under them while sitting stopped in traffic waiting to accelerate and it very noticeable while she held on to the steering wheel while the car was idling and car stood engaged in drive. Passengers have noted the vibration from the back seat as well and said it feel like a massage vibrator. There is no vibration while driving at moderate or high speed, only in stopped or idle.

Weíve taken it back (3 times) and they replaced the heads and did significant replacements of several motor parts with no improvement; in fact the problem has become more noticeable. They (service managers) have consulted with the Hyundai specialists and still no resolve. I have a return appointment this Monday (1-24-05) as they will be looking a several other possible solutions. The service managers are trying and very accommodating; one outside tech suggested something possible in the Torque converter assembly. Can you help us with any suggestion?

John G in Ok.

 
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jeff67's Avatar
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01-22-05, 08:57 AM   #2  
Can't help you with the problem, but you should ask for a loaner car until they can fix yours, especially if you're driving 75 miles each trip back and forth to the dealer. Other's here may give you some insight as to what the problem is.

 
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01-22-05, 12:05 PM   #3  
Well it's a little late to check now but did they road test another similar equipped 2004 Sonata?It may be normal to the design and can't be fixed.You could ask them to check motor mounts,exhaust for being grounded out,balancer bad or any other engine,steering or trans component that may be touching the body of the car at idle.Improper valve timing also comes to mind since it is worse since the heads were changed for no reason.Does it vibrate in park?Maybe the dealer should unbolt the torque convertor from the flywheel to see if it goes away.

 
John G. in OK.'s Avatar
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01-30-05, 06:55 AM   #4  
John G. in OK.
Automotive Moderator (Davo)

Posted By: davo Well it's a little late to check now but did they road test another similar equipped 2004 Sonata?It may be normal to the design and can't be fixed.You could ask them to check motor mounts,exhaust for being grounded out,balancer bad or any other engine,steering or trans component that may be touching the body of the car at idle.Improper valve timing also comes to mind since it is worse since the heads were changed for no reason.Does it vibrate in park?Maybe the dealer should unbolt the torque convertor from the flywheel to see if it goes away.
Thank you for your comments. I took it back and they still have it and will continue to check the vibtration problem. No resolve! They mentioned to me that one of their employees have a 2004 Sonata (4 cylinder) too and has a "more severe vibration" and that's really a concern; as it will continue to worsen. We've only had it less than 3 months and they've had in service at least half that time. We're very conscious and embarassed to have anyone ride or sit in the car and is not an acceptable performance for the car. I've owned a 4 cylinder 1995 Sonata for 10 years with no problem and have driven several Sonatas and Hyundai other models and they have performed well. I not looking for any other effects right now but, the vibration is only in when the transmission is engaged and in the idle postion or sitting (traffic). I will pass your sugggestions to them on Monday (31). Any other suggestions will be greatly appreciated.

 
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01-30-05, 09:09 AM   #5  
I will tell you this from my own personal experience as a Hyundai Technician, that all of the 2.4L 4 cylinder engines vibrated. Some are more significant than others. The reason you dont have that vibration with your older Sonata is the engine is quite a different design. The 2.0 in the earlier Sonatas where not designed the same and did not have this problem. One thing I would recommend checking since you mentioned that it is now worse since the head was changed, is the timing belt and the balance shaft. In this timing configuration there is a separate belt that runs a single balance shaft and then there is a balance shaft that also runs the oil pump. This balance shaft is run by the timing belt. If the balance shaft was installed 180 degrees out then there could be a more significant vibration than the norm. This balance shaft is on a gear reduction (the oil pump) and the timing mark for the pulley can be lined up with the balance shaft actually out of time by 180 degrees. I could be way off here, but if the vibration is more significant than normal operation then it is certainly somewhere to look.
As far as what Davo said, do you notice any noises, like something making contact with the body or other components, metal to metal type noise? Or just any type of contact while this vibration is occuring.
How many miles are on the car?
Hope this helps ya,
Billy

 
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01-30-05, 10:05 AM   #6  
I think billys68ss maybe on to something with that balance shaft. Some of our vibration problems have been mounts that were in a bind. Neutralizing mounts is the fix with these.

 
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