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Hyundai elantra 2013 bucking while accelerating

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New User

Aug 30, 2022, 12:24 PM

Post #1 of 3 (245 views)
Hyundai elantra 2013 bucking while accelerating Sign In

Why does my car buck when accelerating, the rpm goes back and forth repeatedly if i maintain the gas pedal at acceleration but stops when i deacellerate. Usually occurs between 25-45mph and is worse if accelerating uphill. If i slowly speed up everything is fine and also drives fine when on the highway?

Some background, i replaced the crankshaft sensor myself since i got an error code for it and that error code is gone now, also i let the car sit for too long without running it during winter season where it gets about 10-20 degrees Farenheit.. i let the gasoline sit for the duration. Didnt know better. Car is a hyundai elantra 2013. Any help is appreciated. Tried using fuel injector cleaner but dont think its helping at least not yet, only driven about 15 miles since putting it in.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Aug 30, 2022, 1:46 PM

Post #2 of 3 (234 views)
Re: Hyundai elantra 2013 bucking while accelerating Sign In

You need a new a quality code reading again even if no light is on.
Sitting for Winter alone 3 months is enough - each situation might cause real problems or not. IDK on fuel it should last that long without being the problem AND I'm guessing you've driven it a while since last Winter without a problem??

I would say this happens under load you said hills matter too is a load.

BTW, codes don't mean run out and replace what they may say the issue is rather that circuit has an issue or notices it.

Injector cleaners are a wild maybe if any do much it's SeaFoam but don't use much as it says on the label it's nasty strong cause another problem if overdone.

* How long did it sit and did it run OK after that in a few weeks were back to Fall as you know so that's a while ago.

* I too suspect an injector issue but don't rush it and toss one or more it's picking on probably one.

Codes and please post the #s would help the most with this for us,


Hammer Time
Ultimate Carjunky / Moderator
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Aug 30, 2022, 3:53 PM

Post #3 of 3 (229 views)
Re: Hyundai elantra 2013 bucking while accelerating Sign In

These are pretty typical symptoms of a bad Mass Air Flow sensor. It won't necessarily set a code.

Make sure there are no disconnected hoses or leaks in the intake snorkel.


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