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Old 12-24-2007, 10:18 PM
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Join Date: Nov 2007
Posts: 6
Default rough running accent

My 2002 accent, started running rough and using a lot of fuel the last month or so.setting off MIL,put my code reader on it, and came up with po301&po304 cyl 1 & 4 misfire. tested coil & wires , all ok. then checked sparkplugs that i had installed 3 months previous. center electrodes were completely gone on the #1 & 4 plugs," Bosch platinum sparkplugs". I have already sent a letter to bosch to hear their take on this. was wondering if any one else has experienced this? i would be interested to know. B
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Old 12-26-2007, 06:46 AM
Join Date: Apr 2007
Posts: 10
Default RE: rough running accent

Seems very strange that those electrodes are gone. Are you absolutely sure that they where actually changed?
Personally I wouldn't run the Bosch Plats in that car. (just use whatever Hyundai calls for)

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Old 12-26-2007, 04:01 PM
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Join Date: Nov 2007
Posts: 6
Default RE: rough running accent

yes it is very strange, and yes i put the plugs in myself. put some ngk,s in now it runs fine!
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Old 01-11-2008, 11:31 PM
Join Date: Jan 2008
Posts: 15
Default RE: rough running accent

Put Bosch plus 4 plugs on my 99 Accent and 04 Elantra with no problems at all. Great plugs. Maybe the place you got them from gave you the wrong plugs for your car.
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Old 12-05-2008, 01:50 AM
Join Date: Sep 2005
Posts: 48
Default RE: rough running accent

may I ask the part number on NGK sparkplugs?
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Old 12-11-2008, 05:00 PM
Join Date: Dec 2008
Location: in front of the computer, why??
Posts: 38
Default RE: rough running accent

don't waste your money on 'extra prongs' on the spark plugs. use the regular single elecrode. as for bosch +4's i have had problems with them in vehicles that use a waste spark ignition (one coil pack fires 2 cylinders) because the center electrode on the 'ground side' fires from one of the 4 electrodes to the center. it's sorta like trying to land ahelicopter in a hurricane. it ain't always easy.

anyway. po301 = cylinder #1 misfire, so po302 = cyl #2, all the way up to whater # of cylinders there are. po300 is random misfire.

looks like you have it figured out with the fresh plugs, though.

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2000, 2002, accent, car, code, cyclinder, hyndai, hyundai, misfire, po300po301po302, po301, rough, running, runs, wrong

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