Take some time to read through this article. Great info pertaining to plugs.

Spark Plug Analysis - Technical Information - NGK Spark Plugs Australia

 

Nice Article. Thanks for posting!

 

Very helpful for future info. Thanks!!

 

Def a great read. Glad you guys found it useful

 

Thanks man. Changed my plugs and now I officially know that my car is running a little rich. A/F is fine tho. Not too word, going e85 mix soon...probably next month.

 

Nice. I'll keep this handy for spark plug changing time.

 

Great plug diagnostic info!

 

Good info to have thanks for sharing

 

PDF saved for future reference... Thanks a lot.

 

I see this was bumped but its informative and very good info so no harm no foul. see what I did there? ... har har.

anyway I used to change plugs every oil change on the cobalt. easy insurance and theyre cheap and right there on top.

tougher on my LSX now so shes lucky to get every 25k some TR55s

 

With copper plugs I imagine?

 

Yeah, pretty sure he ran the coppers.

 

ngk bkr7e plugs i believe i ran

 

now I run NGK TR55 plugs (LSX) all motor

 

N/a ls motor?

Boosted ls I run the br7ef plug. Non projected tip and works well.