Topic: Indexing Spark Plugs
I daily a Gen 1 Insight, which uses indexed spark plugs from the factory. The engineers who built it were so crazy the head is stamped with the proper type of plug to use.
Do I really need to buy the $10-12 plugs indexed plugs specific to my engine?
People on Insight Central indicate that indexing is critical to achieving the 23:1 air-fuel ratio in the fabled 'lean burn.' Spark plug indexing washers are an option, but by the time I buy decent plugs, the cost will be the same and I am 100% certain I will lose the indexing washers before I need them again.