MSefi.com read only forum (Jan.15,2018)

Hi all, what would a lean cruise plug read look like? If I did a lean cruise plug chop after 4 miles how would the plug look?

Thanks

Sam

They should be white mostly, use a flashlight to look at the base of the porciline, there should be a thin gray colored ring, the thicker and darker it is the richer you are. spark plugs with a hotter heat range will stay white farther from the tip to the base but the ring at the base is what I use to tune AFR. some fuel additives in gasoline will add tanish color