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Discussion Starter · #1 ·
Hey Y'all,

I have a 2017 Kia Cadenza V6 GDI and there is something that is awefully worrying me. (maybe unjustifiably)

Here is the scenario. Imagine you are on a straight road approaching an incline. Up until the incline, you were holding down on the gas to give it some momentum. However, once you reach that incline, you let your foot of the gas, the car slows down mid-incline. I put my foot on the gas again, the car jerks and supposedly downshifts at the same time to attempt to push me up the hill.

Now it all sounds perfectly normal, "as it is trying to push me up hill from a supposedly slow speed", however if we change the scenario a bit by saying, rather than letting your foot off the gas as you appraoch the incline, you continue to give the car some gas so as to continue the momentum. The car will still slow down somewhat and as a result will still also downshift. This time, the downshift is perfectly smooth and goes as expected.

My question is, why the jerking in the first scenario? I know it might make logical sense considering how hard it might have to work now that it has slowed down, however with an automatic car, I would have though that this issue would not be an issue to begin with, just as the whole "controlling the clutch to switch gears" isn't an issue with auto-vehicles.

Any ideas?
 

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It shouldn't jerk at all. It may take a half to full second to decide which gear to shift to and actually perform the shift, and that shift may be a little harsh depending on certain factors, especially if it's not warmed up yet.
 

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Discussion Starter · #3 ·
It shouldn't jerk at all. It may take a half to full second to decide which gear to shift to and actually perform the shift, and that shift may be a little harsh depending on certain factors, especially if it's not warmed up yet.
Well, in my defense "jerk" is the first word that came to mind. However, how would you define "harsh" here? Because this seems to be a very specific scenario, so I think it may warrant investigating those certain factors.

P.S My car does downshift smoothly in all other cases. It is just this case
 

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Harsh meaning it may feel like a hard shift into the next gear as opposed to the normally very smooth transitions between shifts. From experience and from hearing most people have reported the Cadenza (at least the 6 speed ones which I believe are 2014-2017, 2018 and up are 8 speed) can shift harshly when cold and shifting from 1st gear to 2nd gear under steady acceleration. Once slightly warmed up this is not reported as being a problem any longer. Very minor time period. I don't know of any other harsh shifting or jerking shifting patterns from the Cadenza being reported so I'm not sure if this situation describes what you're experiencing or is related in any way.
 

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Discussion Starter · #5 ·
Harsh meaning it may feel like a hard shift into the next gear as opposed to the normally very smooth transitions between shifts. From experience and from hearing most people have reported the Cadenza (at least the 6 speed ones which I believe are 2014-2017, 2018 and up are 8 speed) can shift harshly when cold and shifting from 1st gear to 2nd gear under steady acceleration. Once slightly warmed up this is not reported as being a problem any longer. Very minor time period. I don't know of any other harsh shifting or jerking shifting patterns from the Cadenza being reported so I'm not sure if this situation describes what you're experiencing or is related in any way.
Yea so surprisingly, this "harsh shifting" issue persists even when warm, though it happens when on an incline along with the specifics of the first scenario. Any idea what may be causing it though?

P.S I've had the gearbox replaced a couple months back
 

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I've never experienced this in my Cadenza. Smooth as silk (unless I put it in manual mode, then it's nicely agressive).
 
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