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It depends on the model. Kia Spectra comes with engines that ranges from the 1.5, to the1.6, 1.8 and 2.0 liter models. Most engines have the spark plugs located on top of the engine block under a plastic cover. Under the plastic cover you may find the plugs or two coil packs. In the last case the plugs are located under the coil packs.
They are located underneath the coils on top of the valve cover or valve covers if its a V6. You cant see them untill you remove the coils from the top of the valve cover. Look down in the hole and you will see the Spark Plug. Good luck.
This is general car knowledge. An 04 kia probably has individual coils for each plug on the valve cover. Remove the screws holding the coil on the valve cover, gently pull/twist off (stuck like a cork) plugs should be down deep in cylinder head. Modern engines have iridium (100,000 mi) plugs. Yours could be this ,check the stickers in engine bay.
undo bolts on plastic cover on top of motor,unplug spark plug wire 1 at a time, thats going in the top of motor,u will need a spark plug socket wrench with extension shaft,check electrode gap before installing new plugs!
Four bolts on that big plastic thing - 10mm, if I recall - and the cover over the engine comes off. Two are obvious, the other two are covered by coil assemblies. Not hard - though a tiny bit more work than older cars.
I'm fairly certain those motors require the upper intake manifold be removed to gain access to the rear spark plugs. You might be better off bringing it to a qualified technician as it gets fairly involved. If i remember correctly it's about a 2 hour job and requires a few gaskets.
The 2003 Kia Sorento with V6 has the spark plugs located under
black plastic covers in the center channel of each cylinder head.
Several brackets, cables, and hoses must be moved out of the way to
access them. The manifold air intake tube needs to be removed on the
The left cylinder bank has coil-on-plug assemblies while the
right bank has more conventional spark plug caps with sealing
coil-packs are held with two 10mm bolts each and are difficult to get
to. Use universal-joint sockets and an extension.