Codes p0300-304
Solid cel not blinking.
No other codes.
Car does not lack power, drove fine 3 miles home after getting cel on the highway.
I’ve replaced all spark plugs. One coil. I’ve disconnected the car battery for 10 mins and the codes return.
No oil on driveway to indicate cracked block. No milkshake in oil.
Maybe unrelated, but 4 days before cel came on the center cluster lcd was black(from heat I assume), turning off and on the car made it come back.
Bad gas maybe? Bad fuel pump? Something deeper?
Would buying an obd2 reader with live readings to see misfire count be worthwhile?
https://hyundaithetaenginesettlement.com/faq.html
there seems to be a major class action lawsuit for your model of car.
That’s the 2.0L, I have the 1.6.
many things can cause this, but since it’s not blinking the car isn’t misfiring enough to escalate the code priority. weak fuel pumps and injectors can do that, vacuum leaks, poor engine compression and even an engine that is not timed correctly can do that. first get some fuel injector cleaner and have the fuel pumps pressure tested to see what kind of shape they’re in. then try a compression test (harbor freight has a kit for cheap) or a scan tool that can read live data. the scan tool will show the misfire data and the timing degree. if the timing value is way out of wack, it could mean an issue in the VVT system that the ecm isn’t picking up. it could be a computer issue as well seeing as you had a glitch recently. this article has some helpful tips on finding misfires like these. good luck on your search 🫡