Thread: spark plug reading

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  1. #1 spark plug reading 
    GrandPrix Junkie SgtMarshal's Avatar
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    I changed my spark plugs last night, and noticed that one of them was not flat like the rest, but looked melted, or whatever you want to call it. I am just curious what people think of these plugs, and more specifically, what would cause that one to look deformed like it does.

    https://drive.google.com/drive/folde...1k?usp=sharing
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  2. #2 Re: spark plug reading 
    Killa Bee Scottydoggs's Avatar
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    how many miles on em? the color looks ok at least.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  3. #3 Re: spark plug reading 
    GrandPrix Junkie SgtMarshal's Avatar
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    5000-10000 miles maybe
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  4. #4 Re: spark plug reading 
    Killa Bee Scottydoggs's Avatar
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    if up to 10,000 they are spent, they dont last much longer then that.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  5. #5 Re: spark plug reading 
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    They don't look that bad. I cant tell from the pictures but the one that is slightly rounded may have a slightly off center electrode causing it to fire more on the side. Again I don't think they look bad at all. I run the Iridium XP 103 plugs and replace them every March. What was the gap of the plugs that you removed?
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  6. #6 Re: spark plug reading 
    GrandPrix Junkie SgtMarshal's Avatar
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    I'll have to go look at the gap again to see, but I think it was either .050 or .055. I can't remember exactly. I gapped the new set to .045 at the suggestion of overkill.
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  7. #7 Re: spark plug reading 
    Gun nut and III percenter TexasTanker19kilo20's Avatar
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    Looks like normal burn, but time for new ones, the 3.8 loves AL plugs, although they need change often.
    Goldie 98 Topaz Gold GTP (retired)/ Shadow 06 GTO 6.0 Phantom Black Metallic- traded in. Now cruising a 2005 GMC Sierra 2500 HD 4x4 with the always fun 6.0L
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  8. #8 Re: spark plug reading 
    GrandPrix Junkie SgtMarshal's Avatar
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    I think I forgot to mention I put NGK TR6's in this time, just to try something different.
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  9. #9 Re: spark plug reading 
    Gun nut and III percenter TexasTanker19kilo20's Avatar
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    NGK are good, I always ran AL 106 in my 98.
    Goldie 98 Topaz Gold GTP (retired)/ Shadow 06 GTO 6.0 Phantom Black Metallic- traded in. Now cruising a 2005 GMC Sierra 2500 HD 4x4 with the always fun 6.0L
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