Has your Hyundai / Kia check engine light come on? Is it flashing? Are you wondering why your Hyundai Accent check engine light blinking?
Chances are you have had an engine misfire due to bad spark plugs or ignition coils like I did.
These are fairly straightforward to fix and do not require much time; however, it can lead to engine damage if you do not fix them, especially your catalytic converter.
To be sure, plug in your OBD2 scanner tool on eBay to figure out the engine misfire's code (if you don't have a scanner yourself, you can go to a local auto parts store, and they will do it for you for free).
Once you have determined that it is a cylinder misfire, it is time to change the spark plugs and/or the coils. Spark plugs generate the spark to ignite each combustion event within the car's cylinders to provide the car with power (which is why you might feel you have less power).
Spark plugs that come with your vehicle are made to last about 100,000 miles usually but will sometimes wear out more quickly. They are cheap and range in price from $2-20 depending on how long you want the replacements to last. So try and replace these first (do all of them at the same time).
To do so, follow the instructions below (and see the attached video):
- Turn off your car. Open the car's hood and disconnect the negative terminal of your battery by loosening the nut that secures it.
- Remove the engine cover by loosening the four 8 mm hex nuts and set aside.
- Remove the wire harness bracket by removing the three 8 mm hex nuts and set aside.
- Tip: Before removing the ignition coils, it is good to clean up any debris in this area. You do not want anything falling into the cylinder, causing a lot of problems for your engine.
- Remove the ignition coil connector by pulling out the lock pin and pushing in the tab to release.
- Remove the ignition coil by removing the 8 mm hex nut that secures it, pulls out, and sets aside.
- Remove the spark plug by using a spark plug socket. These 10-inch attachments make it easy to unscrew the spark plugs down in the cylinder and come with a rubber attachment, making it easy to pull out.
- If you don't have the spark plug socket with the rubber attachment, you can use a magnet to pull the spark plugs after you have finished unscrewing them.
- Make sure your spark plug has been either pre-gapped to specifications, or you will need to gap them to specifications yourself.
- Replace old spark plugs with new ones.
- Tip: Do not overtighten spark plugs 15 Nm or 10 ft-lbs is good.
- Replace ignition coils and secure with 8 mm hex bolts
- Tip: Do not overtighten hex bolts. Often they are made of aluminum and will break if you over-torque them. Tighten just enough to secure the coil.
- Reattach the ignition coil connects to the ignition coils and secure by pushing in the lock pin
- Secure the wire harness with the three 8 mm hex bolts
- Replace the engine cover and secure with the four 8 mm hex bolts
- Reconnect the negative terminal of your battery
After replacing the spark plugs, turn on your Hyundai / Kia engine. If you have fixed the problem, then the check engine light should stop blinking, and the engine should run more smoothly when it idles, and you will have recovered power.
The check engine light may persist for a few days but should go away. If this did not solve your problem and you still are getting a blinking check engine light or any of the above-mentioned symptoms, likely you have a defective ignition coil.
You now know how to replace these, and they usually will cost anywhere from $15-40/coil. Fixing this problem is straightforward, will save you money, and will improve your car's performance.