Plug Pics, Good or too lean? Options

[pbanders]

What's your take? Approximately 2500 miles on these plugs. Car is running great, good power, good economy, doesn't seem like it's getting too hot. CO is set to 2.5% at part load. From what I can see, they look good but on the lean side. Top row is cyl 1, 2, bottom row is 3, 4. Ignition is a Crane XR3000 with a Crane PS60 coil.

I'm inclined to leave it as it is.

[Tbrown4x4]

I think you answered your own question, but my aircooled experience is limited. I would normally like to see a little color on the insulator. I'm interested to see what more experienced people say.

[pbanders]

I think you answered your own question, but my aircooled experience is limited. I would normally like to see a little color on the insulator. I'm interested to see what more experienced people say.

Yeah, I agree, the more I look at that matrix, it's too lean. No wonder I get such good gas mileage! (IMG:style_emoticons/default/smile.gif) Runs fine, but it also explains why I have recently found that I need to adjust the idle mixture richer past the factory mark on the ECU knob to get the best idle characteristics, because the main mixture is too lean. I will experiment with 0.5 and 1.0% richer (which would be 3.0 to 3.5%) for the part-load mixture.