While I was installing my new MSD Super Conductors today I took a plug out of each cylinder bank. I am using AC Delco Professional Iridium plugs that were installed with my header install early 2006. I removed (1) from the passenger's side and all looked good. I then went and removed (1) from the driver's side and noticed rust between where the ceramic part joins into the hex metal part. I also noticed a bit of rust on the very top of the hex metal part (curved area in pic below). I have included a pic from AC Delco website to give an idea. Finally, there was a small amount of oil residue on the threads but NONE on the electrode. Any ideas?!?

 

nothing out of the ordinary, most people use di-electric grease between the porcelian and the boot to prevent water from getting in there and rusting things up

it's non conductive so you have to be careful not to push it into the connector

-Erik

 

Thanks for the reply. I did not think it was that big of a deal as I am just used to seeing it on plugs with a lot more mileage/wear. These are relatively new. Thanks though.

 

yeah if you dont use di-electric grease or anti seize on the threads your a fool IMO

but i'm just a parts jockey at napa what do i know lol