Question about 2004 Honda Civic

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Number 1 and 2 cylinder Misfires Action take with no results: 1)Changed spark plugs 2)Changed Coils

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  • derek727jet Nov 17, 2009

    Yes, I used my own OBD-ll scanner and the code was
    P0301, P0302 and P0300 which is cylinder 1 & 2 misfires P0300 stands for ramdon misfires.
    But the scanner will not tell you if it's fuel or emissions related. I started getting a check engine light right after I changed the spark plugs at thier
    110K change due time. Since then I chaned the coil and sparks plugs twice.
    I'm lost!!

  • philschneide
    philschneide May 11, 2010

    Since there are many things that could cause the problem (emission system problems, fuel delivery problems, etc.) you probably would save a lot of time if you took the car to Autozone or some other of the same sort and had them hook their OBD-II scanner to your under dashboard port and get an exact reading of what you computer says is wrong with which system. That will narrow it down, I think, and there is no charge for the scanning. Hope this helps you.



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  • Honda Master
  • 641 Answers

Check injector pulse with noid light. And check injector operation. Also check compression if everything else is ok

Posted on Nov 17, 2009

  • Hector L. Morales Nov 17, 2009

    make sure coils are also working by the way using a spark tester. Make sure plugs are not cracked or damaged.



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