Today I changed the spark plugs on my Jeep. When I pulled the #6 plug I noticed that the gap looked rather large. When I measured it it was .048. All the other old plugs removed measured .035. Upon closer look at the suspect plug I noticed that the center electrode looks worn down / shorter when compared to the another old plugs. Does anyone know what could have cause this or was it just a bad plug? The engine seems to idle and run the same now as it did before.
The plugs removed were Champion 7034 and had 25,000 miles on them. I replaced them with the same.
Worn plug is on the right.