"Car tune up" is probably the most misused and misunderstood all automotive terms. Merriam-Webster defines "tune-up" as a "general adjustment to insure operation at peak efficiency."
- Yesterday's vehicles -- Older model vehicles have a simple ignition system--one ignition coil for each spark plug. The coils are adjusted so that they each provide equal spark intensity, resulting in better idling and acceleration. These coils make a buzzing sound as they work. If they are adjusted properly, they all buzz in tune. Thus, the term "tune-up," applied to the service of replacing spark plugs, distributor points, inspecting or replacing the cap and rotor and possibly replacing the fuel and air filters. It also included several adjustments--point gap, ignition timing and idle mixture.
Source: http://www.excelautoandtire.com/tips-blog/is-a-car-tune-up-necessary
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