Quick spark plug question
#11
That's weird looking. What's the inside of the boot and spring look like? Same thing?
#12
I just changed my 4.6 spark plugs for the first time @160,000 miles. All the plugs had an orange tint on the tip like the one in the photo you posted. I scraped the tip of the plug with a pocket knife to see if it was rust and it was not. I would say it's normal. Probably caused by the voltage being passed from the spring to the spark plug causing discoloration. That's my guess but could be wrong.
#13