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  • [Corsa C 2000-2006] Spark plug colour

    I have bought some new plugs but can't seem to find my socket, but when I had the coil pack off I noticed the ceramic of one plug was tinted brown and so was the metal around the well.

    any ideas what could cause this please?

  • #2
    Sounds like normal wear to me.

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    • #3
      Oil can do that. As above, it's quite common so it's probably nowt to worry about. A photo might help if you think there is an issue. Plugs tend to be in place for high mileages these days so discolouration happens.
      1972 Viva restoration thread - http://www.thecorsa.co.uk/projects-b....html#post1534

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      • #4
        Great. I just thought it strange it was only the one. Thanks for clearing that up.

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        • #5
          Was it the one nearest the oil filler? They often get a bit of oil into them when it's being topped up.
          1972 Viva restoration thread - http://www.thecorsa.co.uk/projects-b....html#post1534

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          • #6
            In the old days plugs used to build up deposits on the tip, chocolate brown was good, white meant fuel mixture was too lean, and black it was too rich or burning oil. Its less common to form deposits these days due to better combustion and spark. But possibly the brown plug has been leaking combustion gases very slightly through its sealing washer.New plugs have a washer that compresses improving the seal. Removing then replacing the same plug means this seal is already compressed and the seal may not always be 100%.It may have been very slightly loose.

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            • #7
              Second from the left. Thanks both

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