Red spark plugs?

az99stang · 12-04-2008

1999 mustang gt 4.6 sohc
I recently changed my spark plugs to NGK tr55ix 7164. I was comparing my two plug gappers and noticed they were different by .05. So what i thought was .054 was really .049. So i pulled the plugs to regap them and noticed they were a fiery red color. I only had them in for a week before regapping them to .054. My question is would the smaller gap cause this red color or do i need to switch to a different type of plug, or is there a more serious problem going on. I also changed from 5w-30 oil to semi synthetic 5w -20oil could this be the cause?

RandyStinchcomb · 12-04-2008

the Red color is prob due to additive package added to the brand of fuel your using, re-gap the plug and go....

az99stang · 12-04-2008

i have been running Lucas fuel conditioner. So, nothing to worry about?

thanks for the rapid reply.

RandyStinchcomb · 12-04-2008

Quote:

Originally Posted by az99stang

i have been running Lucas fuel conditioner

well, there's your answer

you should be good to-go