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> Transmission Gear Ratio, lugging
hosed
post Aug 27 2008, 09:39 AM
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I have a new '08 Sonata i4

At about 65 km/hr "floating" on the level I get a little shudder /thrum feeling like it is lugging ---- press the accelerator and it goes away, or paddle down to 3rd it goes away. Seems like it stays in 4th too much of the time at this speed.
Also, when the automatic goes up thru the gears even tho the tach suggests I am in a lower gear (3rd?) , if I move the gearshift lever to the paddle position it shows 4th gear. Seems to me there is another gear in there that doesn't display.
can anyone clarify all this for me? Thanks
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map-sonata
post Aug 27 2008, 11:02 AM
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Could it be the torque converter?
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imabiggles
post Aug 27 2008, 11:22 AM
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I had exactly the same thing. If you put your car in the shift-o-matic setting at this speed you will notice that your car has been in 4th for a bit. The shudder is a result of the torque converter locking a bit too early, which you will notice by the decreased RPM that occurs exactly at the point of your shudder while floating about this speed. There is a TSB for this issue which involves flashing the car so that the TC locks at a higher speed. I have had this done and it fixed the issue and has not resulted in any difference in economy that I can observe. You will loose you learned shift point behaviour so the car has to relearn them over the next couple of days.

The shudder/vibration was hugely annoying to me - after the flash it is completely gone and zero other issues.

Edit: Link to TSB about the issue and it never hurts to have a copy of it in hand when you go into your dealer:
http://sonata.jerrystout.us/tsb/4cyl_nf_tr...ion_shudder.pdf

This post has been edited by imabiggles: Aug 27 2008, 11:28 AM
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mdale007
post Aug 27 2008, 01:02 PM
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QUOTE(imabiggles @ Aug 27 2008, 11:22 AM)
I had exactly the same thing.  If you put your car in the shift-o-matic setting at this speed you will notice that your car has been in 4th for a bit.  The shudder is a result of the torque converter locking a bit too early, which you will notice by the decreased RPM that occurs exactly at the point of your shudder while floating about this speed.  There is a TSB for this issue which involves flashing the car so that the TC locks at a higher speed.  I have had this done and it fixed the issue and has not resulted in any difference in economy that I can observe.  You will loose you learned shift point behaviour so the car has to relearn them over the next couple of days.

The shudder/vibration was hugely annoying to me - after the flash it is completely gone and zero other issues.

Edit:  Link to TSB about the issue and it never hurts to have a copy of it in hand when you go into your dealer:
http://sonata.jerrystout.us/tsb/4cyl_nf_tr...ion_shudder.pdf
[right][snapback]185693[/snapback][/right]


The same results here. You want the flash done as soon as possible.
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mamamia
post Aug 27 2008, 01:15 PM
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Interesting that the TSB refers to ONLY THE I-4 2008 MODEL YEAR, and to build date between Feb. 8 and Oct. 4, 2007.... I know MANY here were complaining about this issue, and own any model, be it 2006, '07, I-4 or V6........ Maybe the issue is more severe in these specific 2008 cars? I can hardly notice, but there IS a subtle "humming" noise coming from the engine at the said speed, around 40 mph.....








This post has been edited by mamamia: Aug 27 2008, 01:16 PM
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AsmGuru62
post Aug 27 2008, 05:11 PM
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Just wanted to add something about the "secret" mid-way gears. I have seen it a lot of times. Not always a number on the dash (which is from "1" to "5") shows the logical gear. It is like car is on some gear which is between 3 and 4 or between 4 and 5. I can see how I drive say manually shifting and reach gear 5, then I give some gas and look at RPMs and I see how RPMs drop suddenly and car goes easier. The drop in RPM can mean only one thing (IMO) - there is a gear(s) which is like transfer between main 4 and main 5 - like 4.5. There is definitely something there. I have V6. Sometimes it flies and feels simply awesome! And sometimes it lugs horribly. No codes or anything - I think it is just programming of the transmission module.
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SonataRobbie
post Aug 27 2008, 07:01 PM
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QUOTE(AsmGuru62 @ Aug 27 2008, 04:11 PM)
Just wanted to add something about the "secret" mid-way gears...

...The drop in RPM can mean only one thing (IMO) - there is a gear(s) which is like transfer between main 4 and main 5 - like 4.5.
[right][snapback]185767[/snapback][/right]

It's not an extra gear. The "4.5" you referred to is actually 5th gear. When the torque converter locks a little later, it causes a drop in RPM, almost as if the car were shifting into a 6th gear.

hosed, this would be the same kind of occurrence in your 2008 I4, except you only have four gears. In 4th gear, the torque converter will lock as if there were a 5th gear. That's when the shudder occurs. Like others said, it's a known issue and a simple fix.
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hosed
post Aug 28 2008, 09:19 AM
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Thank you for your help, Imabiggles, mdale007, and SonataRobbie.

I dropped in at the dealer yesterday, prior to these posts from you fellows. The service manager was well aware of the symptoms but said this was common to all the Hyundai models and said that the car should "learn" my driving habits and I may notice an improvement over time.

I can see that this is not going to be the case. I'm going to drive it a bit and then go in there with a print-out of the TSB . I still only have about 1100km on the car.

I see that the TSB says the problem applies to the cars with the automatic transaxle. My car doesn't have the transaxle indicator down beside the instrument display dimmer "wheel" ---- so does this mean that my car does not have an automatic transaxle that this flash would apply to?
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hosed
post Aug 28 2008, 09:59 AM
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re my last post --- that light refers to electronic stability control --- has nothing to do with the auto transaxle of course -- I wasn't paying attention.

Interesting to note that the date of the TSB is May 8/08 --- took them a long time.
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trying2like
post Nov 9 2008, 01:26 AM
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has anyone had success with this problem on a 2007? my first trip to the dealer i was told they recognized the problem, but said it was "normal operating procedure". i thought i was being blown off because i bought it used, and still under warranty. but, then i read all the postings here and saw how widespread the condition seems to be and that everybody receives the same somewhat less than satisfactory response. so i took a copy of the TSB for the 2008 and went back, really only asking to clear up the illogic of saying, yes, you have a problem, but, no, we won't fix it. but, all i got was the stock response that the TSB was for the 2008 and therefore not applicable to my car. thanks for stopping by.

would it do me any good to contact the regional director (is that's what he's called)? how about the president of hyundai/USA? or should i just enjoy all the things i like about the car and learn to live with this minor defect?
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