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Normal vehicle usage causes various parts of your engine to lose their efficiency because of under-the-hood temperature and vibration. Regular tune-ups help maintain vehicle safety and performance by ensuring that worn or faulty parts are replaced promptly. Tune-ups can help you achieve maximum fuel efficiency and vehicle performance.

Signs that you need a tune-up:
- Running rough while idling or stalling.
- Decreased performance and fuel efficiency.
- Check engine light is on.
- Knocking or pinging sounds when accelerating or after the ignition is turned off.
- Unresponsive breaking or turning.
Help your vehicle last longer by scheduling regular tune-ups.

A tune-up is a series of adjustments to a vehicle that can include a number of detailed tests designed to improve the drivability of the vehicle.

Here is what a complete tune-up consists:

- Check battery/charging voltage. This is to check to make sure the battery can support the numerous electrical systems.
- Replace spark plugs.
- Replace fuel filter, air filter, PCV valve and other items as needed such as belts, spark plug wires, and hoses.
- Check rotor and distributor cap, replace if necessary.
- Clean fuel injectors.
- Check manifold intake vacuum.
- Check all vital fluids (engine oil, transmission fluid, coolant, brakes, power steering), to make sure all are at the proper level, and that the appearance and condition of each is acceptable.
- Check and adjust ignition timing and idle speed if needed.
- Check ignition wires and ignition performance (firing voltage and ignition patterns).
- Check all emission controls (EGR valve, air pump).
- Check exhaust emissions (verifies fuel mixture, ignition and emissions performance).
- Check compression and power balance (identifies bad fuel injectors as well as compression problems).
- Check safety items such as lights, wipers, horn, tires (including he tire tread, inflation pressure, and overall health of the tire).
- Scan for fault codes (to verify no fault codes are present, or to retrieve any codes that may be present so they can be diagnosed and eliminated).

In order to avoid costly repairs and extend the life of a vehicle, drivers should adhere to a regular maintenance routine, including regular tune-ups.