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I drive a Mitsubishi Nimbus 1998 model. The spark plus are dirty. They were replaced a while ago. Is there any way the spark plugs can be cleaned?

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  • onsses Dec 11, 2008

    Thank you for your reply.

    Dirty spark plugs (misfiring) is shown by car shaking when driving & even while idling. A while ago meant about a month ag. When the service station replaced the spark plugs then, they stated that exhaust gasses (or something simlar) (car is almost 10 years old) causes spark plug build up(?).

    How do I clean them?

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Yes they can be cleaned, if not real bad or oil fouled, but you should determine what's causing them to get dirty first. What exactly do you mean by dirty. (description?)

Posted on Dec 11, 2008

  • Mike Butler
    Mike Butler Dec 11, 2008

    I guess there isn't too many, or any spark plug cleaning machines around anymore, except maybe at your local high school autoshop, or an auto repair place that's been around for a while. You can use a small nylon bristle brush, or wire if necessary, will usually do the job. If needed, you can spray some combustion chamber cleaner, or throttle body cleaner on to help loosen things up, but the brush alone is usually sufficient, then re-gap & re-install. Make sure you wear eye protection. The reason I asked about condition is black & oily, (bad rings, bad valve seals etc) or black & sooty, (excessive fuel mix ) excessive carbon build up ( bad wire, improper spark gap, bad plug,etc.) can indicate problems elsewhere, as well as too clean, excessive white, (too lean mixture, or possible coolant leak). If you google "reading a spark plug" you'll get an idea of what I mean. Good luck.

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