







Picture a 2020 sedan with 65,000 miles. The engine still runs, but you notice a slight drop in fuel economy and the cold start takes two cranks instead of one. That is usually the first subtle sign t...
A spark plug does one essential job: it generates a high-voltage arc that ignites the air-fuel mixture inside the combustion chamber. That explosion creates the pressure that pushes the piston downwa...
Spark Plug Indexing: The Short Answer Spark plug indexing is the deliberate rotation of a spark plug so that the open side of its ground electrode points in a chosen direction inside the combustion c...
Spark Plug Number Meaning: The Code on the Shell Is a Full Specification The letters and digits stamped on the side of a spark plug are not a serial number and not a random sales code. They form a co...