All the photos and info I've been finding don't show anything that looks this chalky white. I've only checked this one cylinder, but let's assume the others are similar (yes, I'll check them later too). Please help me diagnose what this one means:
Yeah the tip narrows down to a fine point, whereas a copper plug tip is just a straight cylindrical shape.tallrd said:Can you tell that those are iridium just by looking?
peepsalot said:Yeah the tip narrows down to a fine point, whereas a copper plug tip is just a straight cylindrical shape.
DAWIV said:I'm on my second set of NGK PZFR6F-11's. Changed the oem plugs at 33,086. They looked normal and showed correct heat range and operating conditions.
Your plug shows that its too hot. Blistered white insulator. What plug number is that?
tallrd said:Thanks for the help guys. I appreciate it.
What would your responses be if I were to tell you that I often backfire from running too rich? Is it possible to be rich enough to backfire daily, but so lean as to make the plugs look like they do? I'm more inclinded to believe it's a temp related issue and not so much an A/F issue.
Thoughts?
p.s. DAWIV: I'm not sure which plugs those are, but I'll look later tonight.
genius said:Rich at idle and lean under boost would be my first guess. My car does the same thing. When you are boosting, the air mixture is cleaning the plugs.
Do you have an FCD? Try driving for a day or two without boosting (if that is possible) and check them again. If they are sooty that is your problem.
Good luck!
tallrd said:Please educated me on what an FCD is.