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Old 10-01-2012, 06:33 PM   #1 (permalink)
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Question Random misfire on #2, 4 ,6

My sonata 2.7L

It's running a little rough, check engine light comes on. I run the scanner and get a P302 code showing random misfire on the # 2, 4, 6 cylinder.

In the last 2 months I've replaced:
-Plugs
-Plug wires
-all three coil packs
-crank sensor
-cam sensor

I'm at a lose on where to go next. I just can't believe this is a spark problem with all those new parts.

Thanks in advance for any help,
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Old 10-03-2012, 11:13 PM   #2 (permalink)
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Low fuel pressure in rail causing injectors not to fire correctly. No/low fuel can cause misfires (or no fires). Plugs not correctly gapped (I believe that is .044) will cause mis-fires and out of the box they are usually wrong...
Tonight I replaced 4 Champion plugs (real junk) in my wife's Kia Spectra and found every single NGK pre-gapped plug wrong out of the box. A worn timing belt will cause timing to shift and plugs to fire at the wrong time. You made no mention of "if" the timing belt has ever been replaced and this is a critical item...If the belt slips or breaks you will trash the engine.
Dave
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Old 10-04-2012, 09:57 AM   #3 (permalink)
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Quote:
Originally Posted by MyKids04Sonata View Post
Low fuel pressure in rail causing injectors not to fire correctly. No/low fuel can cause misfires (or no fires). Plugs not correctly gapped (I believe that is .044) will cause mis-fires and out of the box they are usually wrong...
Tonight I replaced 4 Champion plugs (real junk) in my wife's Kia Spectra and found every single NGK pre-gapped plug wrong out of the box. A worn timing belt will cause timing to shift and plugs to fire at the wrong time. You made no mention of "if" the timing belt has ever been replaced and this is a critical item...If the belt slips or breaks you will trash the engine.
Dave
Thanks Dave,

I replaced the timing belt about 4 months ago at the same time I did the plugs and wires. I gapped the plugs when installing them, but did not use the NGKs. I've been wondering if that is my problem.

How do you check the pressure at the rails?
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Old 10-04-2012, 10:41 PM   #4 (permalink)
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Quote:
Originally Posted by MyKids04Sonata View Post
Low fuel pressure in rail causing injectors not to fire correctly. No/low fuel can cause misfires (or no fires). Plugs not correctly gapped (I believe that is .044) will cause mis-fires and out of the box they are usually wrong...
Tonight I replaced 4 Champion plugs (real junk) in my wife's Kia Spectra and found every single NGK pre-gapped plug wrong out of the box. A worn timing belt will cause timing to shift and plugs to fire at the wrong time. You made no mention of "if" the timing belt has ever been replaced and this is a critical item...If the belt slips or breaks you will trash the engine.
Dave
I'm pretty sure that most NGK plugs do not come pre-gapped.
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Old 10-05-2012, 12:47 AM   #5 (permalink)
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I totally agree that Champion 4 are junk along with the Bosch 4s.... always stick to import parts when it comes to the imports.... Denso, NGK, BeckArnley are some of the import brands. I noticed you said you replaced 3 coil packs... make sure that these packs are also import part -it does make a huge difference or reuse the old packs which probably weren't bad to begin with. Also never have I seen 3 packs go all at the same time. They usually only go 1 at a time...2 is even kinda rare. Just mentioning for future use.
Good luck
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