Posts Tagged: Spark plug indexing

What the heck is spark plug indexing?

Indexing involves installing and torquing the spark plug so the ground electrode is facing away from the fuel injector or intake valve 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 … Read More