Hyundai Elantra GT banner

Carbon build up on stock plugs

3776 Views 6 Replies 6 Participants Last post by  Touring_tech
I had my stock plugs replaced with a set of NGK (1422) ILKR8E6 and noticed the originals looked pretty dirty with carbon buildup. There is only 9K on them, perhaps this is normal or the stock ones were crap. Also, I used a few brands of octane booster which could be the culprit. Any thought anyone has, please share.

Attachments

See less See more
1 - 7 of 7 Posts
I had my stock plugs replaced with a set of NGK (1422) ILKR8E6 and noticed the originals looked pretty dirty with carbon buildup. There is only 9K on them, perhaps this is normal or the stock ones were crap. Also, I used a few brands of octane booster which could be the culprit. Any thought anyone has, please share.
Sure does look dirty. Are you running a tune device that would benefit from 93+ octane? If not why use it? Probably placebo effect at best.
I just changed mine out after 13000km and mine are similarly pretty dark but not as dark as yours.

I'll post a pick after lunch today.
Sure does look dirty. Are you running a tune device that would benefit from 93+ octane? If not why use it? Probably placebo effect at best.
Yes, I have a tuned device GAN. Also I have intake and exhaust mods as well. My tune will handle all the octane I can throw at it:)
Yes, I have a tuned device GAN. Also I have intake and exhaust mods as well. My tune will handle all the octane I can throw at it:)

Are those the OEM plugs? If so, you need to swap them. Any ECU tunes that are offered on our cars, also state the need for colder plugs. HKS M40XL/M45XL
Yes, I have a tuned device GAN. Also I have intake and exhaust mods as well. My tune will handle all the octane I can throw at it:)
That GAN box is causing your car to run super rich. This, combined with low-rev high boost pulls and this is what you get. I’d actually try running a hotter plug. Not the other way around first. Also. Maybe cut the octane booster out of the diet. Lol.
1 - 7 of 7 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top