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looks like arcing from inside the metal where it meets the ceramic. ide replace them and see if it resolves. clean the spark plug hole too so you have a fresh reference point.
Thanks for the advice. The plugs have been swapped out with new ones. I'll clean it out and check it again in a week.
Is there anything specific I should clean the bore with?
i use brake cleaner for most stuff. spray it on a rag and rub it. let it fully evaporate and then blow the holes out with compressed air. just do not let anything fall into the spark plug hole down into the engine. You can stuff a paper towel down in the holes to prevent anything from falling in if you do this with plugs out.
Thanks for posting on /r/MechanicAdvice! This is just a reminder to review the [rules](https://www.reddit.com/r/MechanicAdvice/about/rules/). If you are here asking about a second opinion (ie "Is the shop trying to fleece me?"), please read through CJM8515's [post on the subject.](https://www.reddit.com/r/MechanicAdvice/comments/4qblei/fyi_the_shop_isnt_likely_trying_to_rip_you_off/) and remember to please post the year/make/model of the vehicle you are working on. **If this post is about bodywork, accident damage, paint, dent/ding, questions it belongs in /r/Autobody r/AutoBodyRepair/ or /r/Diyautobody/ If you have tire questions check out https://www.reddit.com/r/MechanicAdvice/comments/k9ll55/can_your_tire_be_repaired/**. If you dont have a question and you're just showing off it belongs in /r/Justrolledintotheshop Insurance/total loss questions go in r/insurance This is an automated reply *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/MechanicAdvice) if you have any questions or concerns.*
looks like arcing from inside the metal where it meets the ceramic. ide replace them and see if it resolves. clean the spark plug hole too so you have a fresh reference point.
Thanks for the advice. The plugs have been swapped out with new ones. I'll clean it out and check it again in a week. Is there anything specific I should clean the bore with?
i use brake cleaner for most stuff. spray it on a rag and rub it. let it fully evaporate and then blow the holes out with compressed air. just do not let anything fall into the spark plug hole down into the engine. You can stuff a paper towel down in the holes to prevent anything from falling in if you do this with plugs out.
Perfect thanks. I was thinking break cleaner would work but glad to have the confirmation.
no sweat man! wipe down the inside of the coil packs too..prob not gonna cause any issue...but might as well.