Spark plug indexing What is spark plug indexing? On some late model engines equipped with gasoline direct injection, it’s important for the open end of the spark plug’s ground electrode to not be directly facing either the fuel injector or the intake valve. Once fully torqued, the open section of the spark plug, where the center electrode can be seen, will be within the center of a 45° range of the injector and intake valve. This final positioning allows for “high ignitability.” How to install a spark plug in an … Read More
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