Posts Tagged: Spark plug indexing

What the heck is spark plug indexing?

Spark Plug Indexing: Maximizing Ignite-ability in Late Model Engines High ignite-ability is really important in late-model engines with direct injection lean burn fuel systems. To ignite the lean mixture, carmakers require spark plug indexing, where you screw in the plug and tighten the plug with a torque wrench. When it reaches the specified torque, it will be properly aligned so the flame kernel can spread most efficiently. Why is spark plug indexing important On some late model engines equipped with gasoline direct injection, it’s important for the open end of … Read More