Who doesn’t like a little trivia on a hot summer day?
While working on his first car prototypes, Henry Ford first used the term “tune up.”
The engine used a simple ignition system with one ignition coil on one plug. There were four of these in total and they needed to be adjusted so that they all produced an equivalent spark. The coils emitted a buzzing sound when they fired and the goal was to make them all “buzz” the same, or be “in tune.”
By the way, speaking of “tune,” most American car horns are in the key of F.