after 35k Miles on my truck I got the plugs changed from stock to denso it-22's.
I've been running my Mods in my sig for about 6 months now on stock plugs.


The weird thing is I have all plugs with more threads and paint on the back end which means those are the stock plugs.
I have only 1 plug which was on the passenger side , front one, that has less threads and is black on the middle. I have never had any plugs changed so I haven't a clue why this one is different. I've not had any knowledge of this truck shooting a plug in the past. I bought it used with 3kmiles on it 3 years ago.

Besides that The plugs look like theyre in great condition. Especially after running 13-15lbs of boost for past 6 months.

PS: I can't find a micro mode for shooting very close up pictures.

 

HMMM, that is strange...That could be a possible reason for the inevitible..

Can anyone give some information on this because i'm very curious also

 

i actually had a 5.4 apart today, i saw the same thing, i noticed at all the plugs had only about 5 threads on them.

 

its been awhile since i did my plugs, but, if the one on the left is the correct plug for us, then the one on the right was probally not letting that cylinder to run optimum, is was way higher in the cylinder hole than the left one would sit..

looking at the tips the one on the right looks wrong, does it have a diffrent code...


jim