I have the same car and had exact same problem plus engine oil consumption all because of broken piston ring. Which lead to burn oil and less pressure on that particular cylinder.
So that cylinder had detonation/pinging sound.
I tried premium fuel for a while it definitely burn better which cause very little pinging for sometime.

Hyundai replaced the engine under warranty (short block).

Check your oil level first and keep an eye, it may be same problem what I had.




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I think mine is using some oil, but not sure it is a drastic amount. About a half quart or so for 5-6 thousand miles.

 

There are at least 3 threads on this board regarding engine pinging.
It is most likely caused by carbon build up in the engine.
Some have had good results of lessening or eliminating the pinging with a few rounds of GDI cleaner.

 

I have a 2015 Hyundai Sonata 2.4L and have the same issue under load but only when the car is cold. After about 5 minutes it's gone. Hyundai had it in last year and did a carbon cleaner procedure and I still had the same problem. They told me that I should use tier one gas and possibly a higher octane. This car should run on 87 octane however so I am frustrated. This week I brought it back to them and they said they can hear it and that they would try new spark plugs and restart the ECM. They did that and I have the same noise. I am going to go directly through Hyundai corporate for an answer or try another mechanic. I have 76,000 miles on it and it started at about 55,000 I believe.

 

Post a video of the knocking

 

Run Premium (90-93 octane) top-tier gasoline.
You can blend your own approx 90-91 octane, by learning how to read the fuel gauge on your dash. Once you learn how many gallons of fuel you will need at the pump (you can learn within one gallon), you can blend 87 octane with 93 octane.

Yes, it requires making two purchases and getting two receipts. It's a better option than using 'inferior' 89 octane, which falls slightly short in the 2.4 performance department.

I know! My 2.4 GDI runs best on 93 octane ( no blending anymore).
Our 2.0 MPI Kia will run great on 87 octane (top-tier). Not fussy at all.

 

Run Premium (90-93 octane) top-tier gasoline.
You can blend your own approx 90-91 octane, by learning how to read the fuel gauge on your dash. Once you learn how many gallons of fuel you will need at the pump (you can learn within one gallon), you can blend 87 octane with 93 octane.

Yes, it requires making two purchases and getting two receipts. It's a better option than using 'inferior' 89 octane, which falls slightly short in the 2.4 performance department.

I know! My 2.4 GDI runs best on 93 octane ( no blending anymore).
Our 2.0 MPI Kia will run great on 87 octane (top-tier). Not fussy at all.

Thanks for the info. I do not have a GDI. I think my biggest issue with it is why should I have to change the gas, when the car didn't require that when I got it at 29k miles?

 

Hopefully you can hear it. This link is to my google drive and it's an audio clip. I tried attaching it here but the site says it doesn't recognize the extension.

 

Since I'm about $600 in already on new plugs, computer resets, gdi cleaner process I'm getting tired of the cost with no result. Is this something Hyundai should cover under the warranty? I have 76k miles on it.