What kills spark plugs?

Spark plugs are always fouled, yet AFR are very good.

New plugs starts the car everytime, but what is causing the sparks plugs to get killed?

have changed ECU twice and still same.

 

Fouled with oil or fuel?

 

 

fuel but AFR's are good

 

Thats an awesome picture pacent, pretty much covers everything!

The AFR reading is only part of the equation, driving habits also play a role.

You also need to make sure the rest of the ignition system is up to par, basics I know but the answer usually is.

 

you also have to make sure you're using the right range, if you're too cold of a plug it can foul out quick. what plugs?

 

And if you are fouling them...how quickly are we talking?

And also when you are pulling them after they foul...do they correlate to any of the pics posted? That'd be your answer.

 

I just noticed the OP has an evo9, are you fouling iridiums?

 

What plugs/HP and when do they get fouled.

Mark