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Thread: Spark plug wear, unusual?
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    Spark plug wear, unusual?

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    Just wanted to pick the brains of the various member on the boards. Did my spark plug change yesterday after having some insane engine sputtering, all is well now though. I do have a picture to show everyone and am looking for some insight.
    Since I'm not aware of the cylinder numbers, I just labeled them from order of removal; passenger to driver side. My driver side plug is insanely black compared to the first three.... Why is this?

    Yes, I am running ethanol, E30 to be exact. Tuned pretty aggressively, no need to disclose the tuner, I feel that is irrelevant. The plugs in the picture are NGK and lasted 16,xxx miles, damn near 2 1/2 years.

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    Member 230 Rep Points Krug's Avatar
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    Looks like cylinder 4 just collects a bunch of crap in the spark plug hole. More important is what the electrodes look like, but you have the sleeves on them so we can't see that. I've seen far, far worse for the outside-ends of spark plugs.

    For example, here's a spark plug I pulled off a 2004 Monte Carlo with 135,000 vs a fresh one:
    Click image for larger version. 

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    Without seeing the electrodes on yours, I gotta say that the "wear" is probably normal and most of what you see is just dirt.
    Last edited by Krug; 03-12-2019 at 08:41 AM.

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    I literally just disposed of them to. The electrode, on cylinder four, was coated black all the way to the tip. Compared to cylinder one (passenger side), the threads all the way to the tip were shiny still. It still had that nice coating to it. The electrode still had its grey "hue" as well.

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    Could it possibly be oil contamination?

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    Senior Member 1173 Rep Points TyphoonFiST's Avatar
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    Quote Originally Posted by draxxus131 View Post
    I literally just disposed of them to. The electrode, on cylinder four, was coated black all the way to the tip. Compared to cylinder one (passenger side), the threads all the way to the tip were shiny still. It still had that nice coating to it. The electrode still had its grey "hue" as well.

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    Dig that shit out of the trash....I have pieces of cardboard with all the spark plugs labeled by cylinder that I've pulled from my Typhoon & they get done every 6k and I started again with my FiST for future reference and to inspect at my leisure. I have a great chart with pictures of what contamination from all the fluids loos like.....ill see if I can dig it up. Couldn't find mine....but this one is good.



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    Dumpster diving in t-minus 5 minutes and counting, that is a fucking awesome chart! Thank you.

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