Pulled my plugs and noticed something odd on only one of my plugs. Anyone know what it is? It's the dark nut looking thing on the white ceramic. Almost looks like a nut from another spark plug or something.

Thanks.

 

Might be a part of the plug wire, that came when you pulled it. Is it plastic/rubber??

 

Maybe the rubber bushing inside the plug socket that helps protect the plug and also holds it so it doesn't fall on the ground when removing and installing plugs.

 

Good point. That's a real possibility as well.

 

Ditto to that.

 

Yea, it's definitely not my bushing and it definitely is not from the plug boot. The boot is too narrow for it. This is why it's best to do work yourself. No offense to any mechanics, but they make mistakes too. I also noticed the wires aren't routed the best way either.

Thanks all. I installed the plugs without this thing.