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Old 10-25-2012, 04:25 PM   #1 (permalink)
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Question P0304 computer code, cylinder 4 misfire

I have a P0304 computer code on my 2003 Sonata 2.4l. Error code indicated misfire on cylinder 4. I changed spark plugs about two months ago, so doubt it's a plug. Guess I need to change the coil pack and wire to that cylinder. Can anyone tell me the location of cylinder 4 when I face the front of the engine? Thank you. Comped
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Old 10-25-2012, 05:31 PM   #2 (permalink)
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2 and 4 have coil,, 1 and 3 is wire..

b
e
l --- 1 -- 2 -- 3 -- 4 ---> transmission
t
s

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Old 10-25-2012, 07:05 PM   #3 (permalink)
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Default Ignition coil pack

Not sure if misfire on cylinder 4 is being caused by defective ignition coil. I would assume if coil pack was bad, then cylinder 1 would also have a problem since wire from coil on cylinder four goes to cylinder 1, but only cylinder 4 misfires. I checked spark plug installed last month on cylinder 4, looks good. Can cylinder 1 still operate ok when #4 doesn't?
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Old 10-26-2012, 02:41 AM   #4 (permalink)
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It is a 'waste spark' ignition system. One of the cylinder sparks will be with reverse polarity compared to the other. Positive polarity spark is requiring higher voltage to 'spark' over the same gap. Both cylinders fire in the same time, but coil might be damaged only on one 'half' of the secondary winding.
What spark plug did you use? I think the best ones for Hyundai are NGK Laser Iridium.

Last edited by SoNic67; 10-26-2012 at 02:57 AM.
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Old 10-26-2012, 12:24 PM   #5 (permalink)
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I replaced the coil packs, cleared error code, and all is well. Thanks to sbr711 and SoNic67 for their help!
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Old 10-26-2012, 12:52 PM   #6 (permalink)
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Good job!
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