Answer: As our engines have changed over time, so have our engine tune-ups. In the past, it was necessary to check and change many more parts. Today, engine tune-ups include checking, diagnosing, and replacing bad spark plugs, spark plug wires, distributor caps, fuel filters, air filters, and oil filters. Tune-ups can also include checking emission levels, fuel lines, wiring, coolant hoses, and serpentine belts. Checking items such as ignition contact points, ignition timing, carburetors, and condensers aren’t included anymore because today’s vehicles include electronic ignitions as well as computers that automatically adjust engine timing when necessary. These tune-ups keep your engine running as efficiently as possible and prevent early breakdown. Regular tune-ups will also extend the life of your vehicle.