How to change spark plugs on Hyundai four cylinder engine
In this tutorial, you will learn how to change the spark plugs and ignition coils on Hyundai 1.8 L four-cylinder engine.
What you will need
Make sure the engine is cooled down. Next open the hood. Clean the area around near the spark plugs and around the ignition coils. Remove any dirt near the spark plugs in order to avoid it from falling into the cylinders latter.
Disconnect negative battery terminal
Since you will be working with electrical system it is a safe practice to disconnect the negative battery terminal.
Remove ignition coils
Next, remove the engine cover and disconnect the ignition coils. Unplug the ignition coil connector by pressing the locking tab and then pulling the connector away.
Use a 10 mm socket to loosen the bolt that secures the coil in place. This vehicle uses coil-on-plug design, therefore you will have one coil on each spark plug. Once the bolt and connector have been removed pull the ignition coils out. If the ignition coil refuses to come up try twisting it slightly then try lifting it up and out.
Remove spark plug
Blow dirt away from the spark plug recess before you remove the spark plugs. Use the spark plug removal tool, ratchet and a 3/8" extension to remove the spark plugs from the engine. Rotate counterclockwise to remove the spark plug. You may need to use a magnet pickup tool to pull out the spark plug.
Install new spark plugs
It is time to install the new spark plug. It is a good practice to inspect the gap using a spark plug gapping tool. Certain spark plugs may come pre-gapped while others such as copper plugs should be gapped.
What are the best spark plugs for Hyundai Elantra?
The original spark plugs installed on Hyundai Elantra equipped with the four-cylinder engine are NGK or Denso iridium coated spark plugs. Below we have listed two highly rated spark plugs that will fit Hyundai Elantra.
- Denso Iridium Long Life Spark Plugs for Hyundai Elantra SX9164
- NGK Iridium IX Plug Spark Plugs for Hyundai Elantra
Frequently Asked Questions
According to the owner's manual of a 2016 Hyundai Elantra, the spark plugs should be replaced every 105,000 miles or 84 months. Keep in mind that depending on your driving style and conditions the spark plugs may last longer or need to be replaced as early as 60,000 miles. The original spark plugs are iridium coated.
Make sure to install replacement spark plugs with the correct heat range.
The OEM Hyundai spark plugs are NGK or Denso. Which one is installed on your car depends on the market where your Hyundai was sold?
Acceptable gap range: .035-.042
Hyundai 18846-11070 1884611070
The average cost to change the spark plugs at the Hyundai dealer or an auto mechanic is between $180-$300. DIY cost (if you already have the tools) is under $50.