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    project_r_dub's Avatar
    project_r_dub Posts: 4, Reputation: 1
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    #1

    Jan 18, 2008, 11:44 PM
    03 civic cyl. 1 misfire
    I have a 2003 civic ex. Recently it started to hesitate and the gas mileage went down about 100 miles/ tank. I got it on a computer and I got a cyl. 1 miss fire code (P0301).
    I changed out the spark plugs the were pretty bured but I've seen a lot worse. Also I got some STP gas treatment. Then on the next tank of gas I used this stuff called seafoam, bassically the same thing but a little better. So I unpluged my battery to reset the check engine light, and the CEL went off. A week and 1/2 later it starts hesitating again but not as bad. Anyone got some advise. Please help. Thanks

    Project_r_dub


    There is no plugs its COIL ON PLUG SYSTEM (COP) it has about 120,000 miles and I replaced the plugs @ 70,000 and just a few weeks ago when I first had the problem!
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
    Uber Member
    		  
    #2

    Jan 19, 2008, 06:43 AM
    Most misfire situations are either spark plug or coil-related. Try replacing the coil going to cylinder 1.
    this8384's Avatar
    this8384 Posts: 4,564, Reputation: 485
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    #3

    Jan 19, 2008, 10:09 AM
    On an '03 Civic, diconnecting your battery is not going to reset the check engine light. You're most likely running an OBD II computer system, which means you need to reset it with a code scanner.

    How many miles are on this car? Is this the first set of plugs you've done? Try doing the plug wires before the coil, if you haven't already.

    P.S. I like your quote, Tx :)
    project_r_dub's Avatar
    project_r_dub Posts: 4, Reputation: 1
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    #4

    Jan 19, 2008, 12:01 PM
    There is no plugs its COIL ON PLUG SYSTEM (COP) it has about 120,000 miles and I replaced the plugs @ 70,000 and just a few weeks ago when I first had the problem!
    project_r_dub's Avatar
    project_r_dub Posts: 4, Reputation: 1
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    #5

    Jan 20, 2008, 02:17 AM
    Its going in to a honda shop on tue. Ill update then thax for the help but I need to get to work tues. night I better go to a pro. Thanks

    Peace in the mid east
    project_r_dub's Avatar
    project_r_dub Posts: 4, Reputation: 1
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    #6

    Jan 24, 2008, 12:04 AM
    It ended of being the 1st Coil on plug (COP) and a ELD basically a voltage reguilator for newer cars. Hopes this may help someone in the future!
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