John,

I decided to cut the plug please note I have quite A few WOT runs on this plug, can I assume that i'm rich up top?



Regards,
Kurt Knight

Guys, Today I decided to pull the plugs on my street driven turbo Honda and I found this on #3. I thought it was a little strange maybe someone can explain what might be the cause of this, these plugs aren't very new and I know my idle is rich, well was rich I pulled fuel since then and just never r...

These are a set of brand new Denso Q20PR-U11, I need to run hotter plugs on the street the 8's were killin me on the cold starts. Still rich I know.



Any timing line??

Even for a street driven car that looks pretty rich - going by the black soot on the base of the plug. The reason the porcelain isn't showing pig fat is that it's a hot enough plug to burn off the deposits I believe. Thanks! Well I have a set of BKR8EIX, i'll try em out also i'll pull some fuel and...

John_Heard wrote:What's it telling you?

At WOT the AFR is approx. 12.1, these 2.2 DOHC VTEC Honda motors likes to idle on the rich side in the 13.4 AFR range. From looking at my plugs would you say the sooty base is normal for a street driven motor?

Thanks for the reply, yes actually I do have the O2 sensor still in there.

Hey Guys, I'm new to this forum and extremely eager to learn as much as I can about how to properly read my spark plugs. The following pictures are from a street driven Honda Accord turbo with an automatic transmission running 13psi max boost, I built and tuned this motor myself the modifications ar...