Thread: What do you think of these plugs? Orange burn marks?

I'm having some major issues with the car which you can read about here:

http://www.grandprixforums.net/rebui...led-51251.html

...but this probably merits its own thread since I have no clue if it's related or not.

I dropped to a 3.4 pulley last year (mods in sig) and didn't have any issues. Car still drove fine, had it scanned for KR twice and both times it checked out okay. Well I put some AL104's in and after 10K miles went to put in a new set. Each plug had these orange burn marks on one side. cyl #1 was the darkest and the higher the cyl. the less the burn mark. Because I wasn't having knock or any driveability issues, I didn't really worry about it. (I run a bottle of gumout fuel inj. cleaner with each oil change and heard that can cause gases which can put weird colors on plugs). Well I am having some issues with either a bad misfire or a bad torque converter (per the linked thread above). So I pulled my current plugs which have only been in for a few thousand miles (3-4K maybe). and there is that orange burn mark again. Anyway, I'm just curious if this is anything anyone has seen before and if so, any idea what's causing it?

Here is the #1 cylinder plug after 10K miles (AL104):



Here is the current #1 cylinder plug after about 3-4K miles:

From what I understand.....golden brown-ish is the color you are shooting for...black is too rich of a fuel mixture, white plugs being too lean.

That is how all of my AL103R's I just removed that had almost 14,000 miles on them...only supposed to last HALF of that.

My most favorite bookmarked plug picture evah...

Cool Chart!

awsome chart sir

Sweet! So I'm good then? No cause for concern? Does the fact that it's only on one side have any significance?

its prob on the side toward the center of the chamber. that pic is in the back of my haynes manual. deff a good one for people to help read their plugs.