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Hyundai Sonata Engine Questions

48 messages,  Last post on Mar 08, 2008 at 8:32 AM

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


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#1 of 48
2004 Sonata I4 Engine Vibration when in drive by jbhome
Jan 16, 2007 (11:12 pm)
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I am looking at a 2004 Sonata with 41000Km/24000Mi. The car is immaculate but... When in drive and stopped, engine noise/body vibration is significant. I'm told they are all like this, however...
My 2000 Ford Focus has similar problems which started several years into ownership and got worse. When cold, the dash vibrated, coins rattled in the cup holder. In 2006, I finally bit the bullet and replaced the engine mounts. Voila, new quiet car. An unbelievable change. So now back to the Hyundai. I think it also has fluid filled engine mounts. Is this the cause? Service says it's rough because of the counterballancer but this should make it better.
Anyone have any experience with this problem.
Thanks,
Jim Brooks
#2 of 48
Re: 2004 Sonata I4 Engine Vibration when in drive [jbhome] by ray_h1
Jan 17, 2007 (11:48 am)
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Replying to: jbhome (Jan 16, 2007 11:12 pm)

Even with balance shafts (the Hyundai 2.4L I4 has two of 'em - counter-rotating), larger I4s exhibit more vibration at idle than their smaller cousins. (I'm assuming your Focus didn't have a 2.4L displacement motor.) At only 24K miles, it doesn't seem likely that there're any serious problems present. (But...) You might have a trusted mechanic take a look and advise you whether there's cause for concern. And, if he'll connect his ignition scope up, you'll know whether it's hitting on all four cylinders. (If the motor pulls smoothly under acceleration, it's likely OK, too.)
#3 of 48
Re: 2004 Sonata I4 Engine Vibration when in drive [jbhome] by jacknzone
Jan 18, 2007 (3:16 am)
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Replying to: jbhome (Jan 16, 2007 11:12 pm)

My 04 Sonata,has 28000 km there is a sound when at idle and it sound like a diesel ,if you are standing out side by the right front wheel you can hear it ,but in the car you can not hear it at all. It is the injector on my car.
It take off smooth and when you turn the engine off , the car stop straight away.
 
Like ray said ,get some one to have a look at it now. For peace of mind.
#6 of 48
Engine breaking during gliding. by donx1
Oct 09, 2006 (11:58 pm)
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My 2006 V6 Sonata is two weeks old and has 300 miles on it. If I accelerate to say 30 mph, and then take my foot off the gas to begin gliding up to a distant stop light, it feels as if the car is goes into engine breaking and begins to slow down fairly quickly. If I push the gear shift into neutral, the RPMs drop from about 1500 to 1000 and the car glides nicely up to the stop light with a very gentle slow down. In neutral you no longer feel any breaking sensation at all. In drive gear the sensation of breaking is very noticeable.
 
I have not had this experience with any other car. For instance my Mercury Sable will glide a long distance with my foot off the gas pedal.
 
Is this normal for the Sonata? Won't this contribute to poor gas mileage if the engine is breaking when it's not needed? I have read it's not safe to shift into neutral while coasting?
 
 
#7 of 48
Re: Engine breaking during gliding. [donx1] by snakeweasel
Oct 10, 2006 (4:58 am)
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Replying to: donx1 (Oct 09, 2006 11:58 pm)

The engine should give resistance when you take your foot off the gas in any car. You may notice it more in certain cars but I guarantee you that this happened in your Sable too.
 
The question I have is do you just accelerate to 30 and take your foot off the gas? or do you cruise for a while at 30? If you accelerate rapidly to 30 then take your foot off the gas then you are most likely in a lower gear and the effect will be greater than if you were cruising in a higher gear.
#8 of 48
Re: Engine breaking during gliding. [donx1] by mamamia2
Oct 10, 2006 (8:56 am)
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Replying to: donx1 (Oct 09, 2006 11:58 pm)

This is totaly normal. Some modern cars have it a LOT more pronounced (to a point of annoyance), like the Honda Accord... It's the way modern transmissions are designed today.
#9 of 48
Re: Engine breaking during gliding. [snakeweasel] by donx1
Oct 10, 2006 (10:56 am)
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Replying to: snakeweasel (Oct 10, 2006 4:58 am)

I cruise at 30 mpg for a while and then anticipating some stopping ahead I take my foot off the gas. I checked this morning and the car is in 4th gear. As soon as I take my foot off the gas, I can feel the car engine breaking but it doesn't show any downshifting taking place. If I manually down shift to 3rd the engine breaking becomes significant.
 
I did a little test. It takes about 14 seconds for the car to slow from 35mph to 25 mph when it is in gear with my foot off the gas. If I throw the car into neutral immediately after removing my foot from the gas, it takes over 35 seconds to effect the same slow down. A look at the RPMs shows the difference as well, 1500 dropping to about 1000 rmps with my foot off the gas versus an immediate 800 rpms in neutral. I assume that's gas saved but I didn't know if the amount is significant.
 
Your right my '95 Sable does show some effect but not nearly as significant as the Sonata. I wondered if it was a breakin thing or if that is permanently how cars behave these days?
 
#10 of 48
Re: Engine breaking during gliding. [donx1] by mamamia2
Oct 10, 2006 (11:38 am)
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Replying to: donx1 (Oct 10, 2006 10:56 am)

No, not a break-in issue, and again, this is how most, if not all newer cars behave.
 
And again, if you drive an Accord, you'll feel it even more... Actually in the Accord's case, the NEWER Accord has this a bit less pronounced than the older Accord... My '95 Accord was almost annoying the way it would down-shift the second I lift my foot of the pedal, at around 30-40 MPH. Our '05 Accord is more smoothly doing it, but still more noticeable than my Sonata. It's called something like "downgrade logic"...

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