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Old 07 Feb 2013, 06:04 am
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Default 2004 honda civic dx diagnosic mach said all 4 cylinders are miss firing?

Ran test on 2004 Honda civic ex and came back saying I had misfired on every cylinder and sometimes multiple misfiring
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Old 07 Feb 2013, 06:19 am
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Have you done any work under the hood recently? It's possible you could have knocked something loose and it is causing the malfunction.































Check your coil packs on top of the spark plugs to make sure they are secure, or you can test them to make sure they are working properly.































It may also be possible that the spark plugs simply need to be changed. A good copper spark plug is all you really need for your engine, and if the plugs are old they could have a lot of carbon buildup which prevents them from sparking correctly. If you are using platinum style "+4" or triple tip plugs, they could also cause that problem. I used a set in a Honda and they went bad after about a week, but with copper plugs the car ran perfect.
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