"To tune an engine" means to make adjustments and modifications to optimize its performance, such as improving power output, fuel efficiency, or overall operation. Full definition
It comes with an enhanced aerodynamic design, a specially tuned engine and a rear spoiler, all of which help it to get an impressive 40 highway mpg. (toyotaofdallas.com)
The engine configuration also makes it practical to tune the engine so that the fuel in a combustion chamber burns very quickly. (treehugger.com)
Particularly, I am proficient in diagnosing problems by utilizing computerized testing equipment, fine tuning the engine, enhancing fuel consumption and improving drive quality. (coverlettersandresume.com)