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by bigmac on October 30th, 2008

bigmac

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I have a2003 dodge durango and the number 7 spark plug fouls out about every month and a half the the engine starts to run really rough but when i replace that spark plug the car runs like brand new,what would cause this one plug to continue

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  • by sloppywet on November 6th, 2008

    sloppywet

    the intake gasket may be blown.

    Comments

    • If the intake had an air leak, it would lean it out, but not "Foul" it. If it is covered with "Oil" it could be bad "Valve Stem Seals" allowing oil past them fouling the plug. Add to that "Leaky Valve Seats" & U get an incomplete burn which fouls the plug. So, check the compression & do a "Leak Down" test on All Cylinders. If it's just the "Seals" it's not too big a job with a compressor,spark plug air chuck & valve spring compressor. John

      Moosemose

      by Moosemose on November 6th, 2008

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You're reading I have a2003 dodge durango and the number 7 spark plug fouls out about every month and a half the the engine starts to run really rough but when i replace that spark plug the car runs like brand new,what would cause this one plug to continue

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