Car was fouling BAD! so I removed the plugs and I had yellow powder on them, all of them! I have done a few mods and Im running the stock Vortech map. My air/fuel at wot is 9.8 at idel its 14.9 any ideas?

 

Not cheese puffs, they are orange...
Yellow to me means Sulfer, did you get a bad tank of fuel? Or perhaps Leaded Fuel?

Cheers Amy -

 

Hmmm maybe, you know how our gas here in cali is!

 

I found this but the yellow for the most part was on the top of the plug.
Symptoms
Shiny tan or yellow deposits suggest that temperatures have suddenly increased under severe loads. Excessive high temperatures can result in the glazing of the spark plug insulator by allowing fuel and combustion chamber deposits to melt rather than burn off in a normal manner.

Recommendations
Replace with spark plugs of the correct heat range.

 

Are you running one step colder plugs?

 

Anyone have a link to that page that has a bunch of pics of different spark plug appearances with a description of what each means? It was posted about 2-3 months ago and was very informative.

BTW, isn't 9.8 at WOT kinda rich? Mine has always been 11.5

 

Heres the chart, Im running one step colder. Im going in for a tune soon but want to get my headers installed first.

 

That's the one! Thanks.