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Unread 10-14-2013, 12:47 PM   #1
Registered User
2004 TJ Wrangler 
Join Date: Sep 2008
Location: Virginia Beach, VA / Dubuque Iowa
Posts: 225
Worn Spark Plug

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.

flying2275 is offline   Reply With Quote
Unread 10-14-2013, 01:55 PM   #2
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2002 TJ Wrangler 
Join Date: Sep 2013
Location: KELOWNA, BC
Posts: 26
My guess would be that the little platinum plug that's on the end of the center electrode wasn't attached properly and just fell off. Then you'd have the raw copper electrode underneath eroding at a fast rate. When I pulled out the copper plugs the previous owner had on my TJ, the wear was up to .055" at the gap. That's what yours was doing.
I put in the double platinum Champions as recommended on this forum, and they made a big difference.
JeepUke1 is offline   Reply With Quote

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