Around 92000 miles the car started to have a little rough idle, not bad enough to worry about. But as I let the issue go, it gradually got worse with the car missing while idling pretty much all the time. Replaced the spark plugs 3 times, each time gave me about a week of running well and then back to the rough idle. Replaced both O2 sensors just in case, no change in idle. Eventually my car pretty much choked out at an intersection where I finally got a code, P0303. Did some research online and found there is a common coil issue with this car, so to test the theory, I swapped the coils in #1 and #3, cleared the codes, drove it around the block, check engine light comes on, now I've got a P0301. Common sense seemed to indicate I had a bad coil. Replaced it with an autozone coil. Car ran awesome for almost exactly 2 weeks, which leads us to present day, and it's starting to idle rough again. Research online again seems to indicate that this model and year has major coil issues, with folks having to constantly replace the coils. This doesn't seem legit so I'm searching for an answer to why the coils are going bad. Please help!
Why did the coils in my Accent start going bad at 92000 miles? on 2011 Hyundai Accent
by acoll in Colbert, WA on July 31, 2014
ANSWER by pushrod on July 31, 2014
It's because those folks are putting junk parts on their cars!!.... At that mileage, you could have driven around the world almost 4 times!!... Replace the coils and plugs with Hyundai (OEM) parts and drive on....you'll be saving money the whole time!!!!