In automotive maintenance, what does "tune-up" generally include?

The term "tune-up" in automotive maintenance is traditionally associated with a set of services aimed at ensuring an engine runs smoothly and efficiently. This typically includes replacing spark plugs, inspecting the ignition system, and checking filters such as the air and fuel filters.

Replacing spark plugs is essential because they ignite the air-fuel mixture in the engine's cylinders. Worn or fouled spark plugs can result in poor performance, decreased fuel efficiency, and increased emissions. Inspecting the ignition system ensures that components like wires and coils are functioning properly, further contributing to optimal engine performance. Additionally, checking and possibly changing filters is important to maintain proper air and fuel flow, which is necessary for efficient combustion and engine operation.

Other options listed pertain to different aspects of vehicle maintenance. For example, changing oil and rotating tires are important but are not typically classified as part of a standard tune-up. Similarly, wheel alignment and brake pad replacement are distinct services focused on the vehicle's handling and safety rather than engine performance. Lastly, flushing transmission fluid and cleaning fuel injectors are more specialized services that impact specific systems within the vehicle, rather than broad engine maintenance that a tune-up encompasses.