check engine light on 2013 hyundai during texas heat

You could have the code read .

Visit your local auto parts store and have them scan the computer for trouble codes. Most stores will do the scan for free. Post the codes you get and we can help further. Jim

P0304 Cylinder 4 misfire detected

Here's some info ... I just had a tune up in March 2022 by Midas, who replaced the spark plugs. I can't say I trust them to go back. O'Reilly said to try replacing the spark plugs because sometimes off brands aren't good. I'm not sure what the coils do in relation to the spark plugs but I know they are together.

The coils provide the high voltage to create the spark of the spark plugs. The spark ignites the air and fuel mixture inside of the cylinder like a mini explosion. That mini explosion forces the piston, which is inside of the cylinder, downwards to give you power. So if the coil on cylinder number four is bad you won't get the spark that you need to ignite the air and fuel mixture. When that happens it's called a misfire. One way to check the coil is to move the coil from cylinder number four to another cylinder. If that cylinder begins misfiring instead of cylinder number four, the coil is definitely bad. A word to the wise about bad coils, if one has failed the others are soon to follow. It's best to replace all the coils together so you don't have to worry about them again. The problem is if you replace a bad one today another one might go bad a few months from now, then another, and so on. Hope that helps and thank you for the best answer click too! Jim

Thank you VERY much Jim!

You're welcome. Glad to help! Jim