Spark Plug Reading
Get help learning if your car is running too rich, too lean, too cold or too hot.
There is a great website with a load of pictures for each event located here:
http://www.dansmc.com/sparkplugs1.htm
There's a link on the page to additional 30 images of plug conditions.
Spark Plugs
While this is a motorcycle site, spark plugs react the same ways in cars.