Well this is a very unusual thing! Did a top speed pull yesterday with my F-250 and when it was done it had a bad misfire. This was what I found.




Just changed them about 10k miles ago, NGK Laser Iridium, Probably my fault for running an 87 performance tune and much hotter coils on stock temp spark plugs but I figured some of you would like to see a little destruction

 

What you have there is a cheap aftermarket plug repair kit, probably a Dorman or HeliCoil, that was used to repair a blown plug. Blown again, not surprisingly.

 

Im well aware , I was the one who did the repair when it blew but it didn't blow this time, Just melted inside the cylinder due to spark and heat

None of the plugs should blow, The heads have already been cleaned up. The Heli-coils shouldn't come out except in this case where it was practically welded to the spark plug, Ended up damaging the threads when I wrenched it out though so i had to re tap them

 

 

Check codes to see if it was running lean

 

I did and no codes, All the other cylinders were running fairly lean too. I plan to call 5star and have them add a tad more fuel to the tune. I think the aftermarket coils are actually burning nice and hot. I also need to find a colder plug for this truck which would help greatly

 

Timesert carries a helicoil repair insert you might want to check out.
If I've been reading the posts correctly over on the Excursion forum the general consensus is to not use helicoils to repair Triton heads and stick with Motorcraft plugs.
I had #3 blow on our Excur and the Timesert repair has 20k on it - no issues.

 

I don't see anywhere here what caused the melt down of your plug. I'm dealing with an '08 6.8 Titan that is melting all plugs. I've been a mechanic most of my 66 years and I'm baffled. The only thing I could possibly think it is would be a crank positioning sensor signaling the computer to stay lit.

 

The tunes I have from 5 Star have the option to enrich the fuel mix. I did an update last year with a customized tune and I ran across it in the menu. Maybe an update is needed? I run about 6% richer and when I changed plugs, they looked good.

 

Im still baffled by it honestly. Do me a favor and find the next step coldest plug and give that a try, just for s***s and giggles

 

Not to bash a company but i deleted all my 5-star stuff. After the v10 incident i checked everything for the twin turbo engine I'm doing now. Couldn't find a thing and when i pulled the passenger head off my old long block it had 2 more melted plugs i missed. Later tried the tunes for 6.7 Powerstroke and yikes.... I have since bought software and just decided to stick with my own tuning. I'm not saying their stuff is really bad, but the timing is all over the place. Personal opinion.