Don't bellive there is power to the spark plugs and i think it's a timing problem
Coil pack might be goi
SOURCE: how do you change the spark plugs on a kia optima 2.7 v6
you have to remve the bolts on top and sides of the plenum assy be sure not to drop anything down in the lower intake!!!!! the bolt heads are 12mm and there are 2 on top 2 on the ends and three int the front
SOURCE: Changing back spark plugs underneath engine cover
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.
SOURCE: Where are the spark plugs on my 2003 kia optima located.
take off the top cover. There is 2 coils take off the coils (there is a spark plug under them and a wire from each coil runs to the other plugs.
SOURCE: i have a 2004 kia optima 2.4 4 cyl. engine will
Try you ignition module if you have verified the plugs/coil being in good working order..
SOURCE: what is the gap for spark plugs on 2004 kia optima
If you have the 2004 Kia Optima 4-2400 2.4L DOHC engine, the factory recommended spark plug gap should be .044" Hope this helps!
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