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One or more spark plug wires could be going bad. The porceline insulator on a spark plug could be cracked.
It is important to keep the spark plug gap in mind when replacing the spark plugs of a car. For a 2003 Kia Spectra the spark plug gap is .039-.043 inches.
2003 c320. So a v-6 correct? They are located on both sides of the engine. Your engine will have spark plug cable wires going from the ignition coils to the spark plugs, you need to remove the cables off the plugs before you can remove the spark plugs.
The coils are bolted to the side of the engine, The spark plugs are under the coils, NO PLUG WIRES. unbolt the coils and use A spark plug socket.
On the 2.3L and 3.0L engines, remove the top plastic engine cover and remove the rubber spark plug wires (4 of them for the 2.3L and 6 of them for the 3.0L) to gain access to the spark plugs.
with a 10mm socket remove the two ignition coils and the two spark plug wires, using a 5/8 spark plug socket and one long extension and a ratchet remove the spark plugs and install the new ones
First you remove the plastic engine cover on top of the valve cover. Then you remove the wires from each of the three coils, then you remove the bolt holding each coil and remove coil. Down in that hole is the spark plug, remove with socket and replace.
You should never need to replace the wires leading to the spark plugs. The 2003 Miata has a coil pack at each spark plug (inside the spark plug hole). The wires leading to the coils are low voltage and should never break down.
Broken spark plug wires will keep almost any car from starting.
Looking at your engine you will see on top 2 black blocks (coils) and wires that come out of them into the engine. Pull the wires from the engine, and unscrew the coils from the top and remove them. Once you do, youll be able to see the plugs and remove them.
kia recommends every 30 months or 30,000 miles
take it to dealer