John S Posted July 26, 2023 Share Posted July 26, 2023 These are a couple pictures of the spark plugs. I pulled out of my 350. Just curious to hear some of your thoughts are on how it’s burning. I personally think it’s fine, better than most. John S Quote Link to comment Share on other sites More sharing options...
1970mcss Posted July 26, 2023 Share Posted July 26, 2023 They look good to me, any issues?? Quote Link to comment Share on other sites More sharing options...
John S Posted July 26, 2023 Author Share Posted July 26, 2023 46 minutes ago, 1970mcss said: They look good to me, any issues?? None at all the exhaust pipes are clean at the exhaust tips. Those are R43S spark plugs, a colder spark plug than what is called for. I was curious what some of the people on this forum who are more knowledgeable on engines than myself would think. 1 Quote Link to comment Share on other sites More sharing options...
Rob Peters Posted July 26, 2023 Share Posted July 26, 2023 John, they don't look horrible but you do not specify how long (miles or time) they have been installed, incase that would enter into someone else diagnosing how they look. rob 2 Quote Link to comment Share on other sites More sharing options...
jft69z Posted July 27, 2023 Share Posted July 27, 2023 They look fine for the most part. They appear to be burning evenly, without any major oil fouling, or one ugly duckling that looks completely worse than the others. As Rob asked, how many miles? https://ngksparkplugs.com/en/resources/read-spark-plug https://www.motortrend.com/how-to/spark-plug-reading-101-dont-leave-hp-table/ 1 Quote Link to comment Share on other sites More sharing options...
John S Posted July 28, 2023 Author Share Posted July 28, 2023 On 7/26/2023 at 8:27 PM, jft69z said: They look fine for the most part. They appear to be burning evenly, without any major oil fouling, or one ugly duckling that looks completely worse than the others. As Rob asked, how many miles? https://ngksparkplugs.com/en/resources/read-spark-plug https://www.motortrend.com/how-to/spark-plug-reading-101-dont-leave-hp-table/ Three years little over 8000 mi 1 Quote Link to comment Share on other sites More sharing options...
John S Posted July 28, 2023 Author Share Posted July 28, 2023 On 7/26/2023 at 7:33 PM, Rob Peters said: John, they don't look horrible but you do not specify how long (miles or time) they have been installed, incase that would enter into someone else diagnosing how they look. rob Three years and a little over 8000 miles. Quote Link to comment Share on other sites More sharing options...
stangeba Posted July 28, 2023 Share Posted July 28, 2023 Looking good! Thanks, now I feel like I need to look at mine. I replaced the spark plug wires in 2009 but no record if I did plugs. That was 16,600 Miles ago. Quote Link to comment Share on other sites More sharing options...
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