There is a guide on how to replace the spark plug in the engine of thekia forte

Check or change the engine spark plugs in a 1st generation 2010-2013 Kia Forte with the Theta II 2.0L I4 motor.

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There are also owners of other vehicles such as the Genesis, Cerato, and Sephia.

The tools that are needed to complete this procedure include a 10mm sockets with a drive wrench and a tube of grease.

There are a few compatible replacement spark plugs with their part numbers.

If you have access to compressed air or a wet/dry shop vacuum, you should clean off the top of the engine to prevent debris from falling into the cylinder well.

If you want to reduce the risk of debris falling into the engine, you should only check or change one spark plug at a time.

The single bolt that holds the ignition coil needs to be loosened by turning it counterclockwise.

Make sure the rubber dust boot is not stuck to the old spark plug by rotating the ignition coil back and forth.

Don't use excessive force to loosen the old spark plug to prevent it from cracking.

If you can't loosen the old spark plug, spray a small amount of penetrating oil and wait at least 15 minutes before trying again.If you don't have any penetrating oil, you can warm up the engine for a few minutes and try to expand the metal engine block.

When the old spark plug is loose, you can detach the ratcheting wrench and spin it out by hand.

If the end of the old spark plug looks ashy white, it could be that the plugs have been exposed to high temperatures or the wrong heat range for your environment.

If the old spark plug is grey or covered in dark black soot, the engine may be burning oil and should be examined by a professional mechanic.

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A rubber insert or strong magnet should be used to hold your spark plug in place.

The spark plug must be spun in the clockwise direction until it makes contact with the cylinder head.

Attach the drive wrench to the extension bar and tighten the spark plug in the clockwise direction.

If you are re-installing the old spark plug, make sure to tighten it to a very small fraction of a turn.

When you feel the new crush washer collapse, tighten the spark plug to just past the point.

If you tighten the spark plug, it will cause the ceramic body to crack or the aluminum threads to be stripped.

Remove the 10mm bolt and tighten it to secure the coil.

The plastic ignition coil housing can be cracked if the 10mm bolt is tightened too much.

Start the engine and listen for strange noises that may indicate a problem such as a faulty wire, a disconnected power plug or a loose spark plug.