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Thread: Corrosion on 1 spark plug, other 2 find. Need thoughts/advice

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    Senior Member Dirk Diggler's Avatar
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    Corrosion on 1 spark plug, other 2 find. Need thoughts/advice

    My mech buddy and I changed out the spark plugs @ 77k miles. One had bad water corrosion (we think). We used new OEM plugs. I'm hoping this improves my mpg. What could cause this? Bad gas?

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    Senior Member Dirk Diggler's Avatar
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    Senior Member Dirk Diggler's Avatar
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    Senior Member Dirk Diggler's Avatar
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    Senior Member Fummins's Avatar
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    That's odd. No bad gas won't make the top of your spark plug turn green.

    What the hell is that white stuff around the spark plug hole? Did someone try to seal it with silicone or something?

    How does the spark plug boot on that cylinder look? Cracked? I'd defineatly consider at least replacing that one spark plug boot and get rid of that white stuff.

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        click to view fuel log View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)


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    Moderator inuvik's Avatar
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    That green and white residue look like electrical contamination. One of your coil packs might be bad?

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        click to view fuel log View my fuel log 2015 Mirage ES 1.2 automatic: 40.4 mpg (US) ... 17.2 km/L ... 5.8 L/100 km ... 48.5 mpg (Imp)


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    Senior Member Dirk Diggler's Avatar
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    Quote Originally Posted by Fummins View Post
    That's odd. No bad gas won't make the top of your spark plug turn green.

    What the hell is that white stuff around the spark plug hole? Did someone try to seal it with silicone or something?

    How does the spark plug boot on that cylinder look? Cracked? I'd defineatly consider at least replacing that one spark plug boot and get rid of that white stuff.
    The plug boot had some white markings on it that we wiped off. As for the residue, his only guess was water contamination. I'm going to test it on the hwy, see if my mpg gets better with conservative driving.

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    Senior Member Fummins's Avatar
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    Inuvik might be more righter. The coil might be weak.

        __________________________________________

        click to view fuel log View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)


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    Senior Member Dirk Diggler's Avatar
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    Quote Originally Posted by Fummins View Post
    That's odd. No bad gas won't make the top of your spark plug turn green.

    What the hell is that white stuff around the spark plug hole? Did someone try to seal it with silicone or something?

    How does the spark plug boot on that cylinder look? Cracked? I'd defineatly consider at least replacing that one spark plug boot and get rid of that white stuff.
    You think that could be affecting my mpg? I had a coil replaced according to this in 2019.

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    Senior Member Dirk Diggler's Avatar
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    Corresponding dates, sorry, doing this on my phone.

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