Possible issue with downshifting on 2015 SFS automatic - Hyundai Forums : Hyundai Forum
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post #1 of 6 (permalink) Old 04-19-2017, 04:58 PM Thread Starter
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Possible issue with downshifting on 2015 SFS automatic

Not exactly sure how to describe this. Checked some threads and didn't see anything resembling this. Might not even involve the actual downshifting of the gears but it's my closest guess. I've noticed when the car is slowing down, and especially so when I let it coast, and it gets to around 20/30mph all of a sudden there's a slight lunge and the rpms jump up from say 1 to 2 or 3 and stays there for around 5 seconds or so then comes back down. Have even seen it do it twice if I coast long enough. It will also do it when braking but if I'm braking hard enough it kinda powers through it. I thought I read something in the owners manual about something semi-similar to this to avoid who knows what but now I can't find it and doubt it's what is happening. Not something that is horribly annoying but for all I know it could be the start to something worse. Besides that no problems so far. Only had the car about a month or so.

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post #2 of 6 (permalink) Old 04-19-2017, 07:40 PM
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It's designed that way to increase fuel economy. When you coast, the fuel injectors get turned off, so the transmission downshifts while keeping the torque converter locked, this keeps the engine spinning enough to power the alternator, water pump, etc... When your speed gets slow enough and you feel a lurch, that's when the torque converter unlocks and fuel injectors fire back up.

Basically, when you're coasting, the momentum of the car is the only thing keeping the engine running.
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post #3 of 6 (permalink) Old 04-19-2017, 08:43 PM Thread Starter
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I'm sure this isn't the first car to have that as part of the design but this is the first time I've felt it enough to question if it was supposed to be happening. But how you described it makes sense so that's got to be it. I'll just have to get used to that feeling of thinking you're stopping and then the car feels like it wants to take off again. Could be a lot worse things that could be happening. Thanks for the help
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post #4 of 6 (permalink) Old 04-20-2017, 09:14 AM
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I agree with the way these things feel when coasting. The only thing that doe snot add up to me is the tachometer jumping to as high as 3,000 RPM. Mine stays well below that. At 3,000 RPM you should have a fair amount of engine braking in play and I have never felt that.

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post #5 of 6 (permalink) Old 04-20-2017, 04:20 PM Thread Starter
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Yea I checked it again last night and it doesn't go over 2 ever. Usually hovers just under it. Not sure if that makes a difference but figured I'd mention it
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post #6 of 6 (permalink) Old 04-24-2017, 09:56 AM
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OK....That puts it pretty much in line with what I see as well. I am not fond of that feeling and back when we had our 2007 Entourage (Which had that same feel in the 5 speed automatic) I checked for software updates regularly and nothing ever came out to change it.

I became accustomed to it but I still notice it. Anyone in tune with their vehicle always will. One of those normal operating characteristics that you just have to live with.

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