Question about 2004 Mazda RX-8

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Coil problem [ misfire DTC code]

My scanner said misfire problem, i tested all the coils and found only 2 of the coils were getting an electric pulse i don't have a wiring diagram so i don't know if it is a computer problem or a sensor or wiring problem,i have been told the car was driven while raining when the problem started now the cat won't idle and only runs on one bank,thanks.

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  • Ed May 15, 2011

    as i said before only 2 of the coils were getting a pulse to the low tension side so why would you think the coil was faulty? i eventually found the fault and it was a fcuked ecu

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Rx8 have a history of coil packs going bad internally and grounding out. best way to check if theyre bad is to pull the packs and inspect the back side. if you have discolorationg on the back side your packs are bad or are going to be bad soon. inspect the plugs if they are fouled or burnt replace them along with the coil packs.its a good idea to replace the wires too. and do not use cheap aftermarket parts. this will only cause more problems in the future. use oem or performance parts.

Posted on Dec 05, 2008

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Start by checking to see if the spark plugs have fouled and if they need changing, change the wire's whilst it's all apart.

If you've had problems with flooding or bad ignition after short journeys, try a warmer heat grade plug on the leading side.

RX8 spark plug & wire install guide

If this doesnt solve the problem then try the ignition coils. Use the genuine Mazda part, but make sure they are the REVISED ones used on later RX8's as standard to battle this common problem.

Revised Mazda RX8 coil packs - N3H1-18-100B-9U

Posted on Apr 02, 2011

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