A professional who tunes automotive vehicle engines to ensure efficient operation. Respnsibilities include:

• Removes spark plugs, using socket wrench, and tests them, using spark-plug tester.
• Cleans electrodes in sandblasting machine, sets spark gap with feeler gauge, and replaces or installs new plugs.
• Inspects distributor breaker points for wear and pits, using feeler gauge, and replaces or resets points.
• Observes ignition timing, using timing light, and adjusts timing, using handtools.
• Adjusts carburetor needle setting, using handtools, and verifies adjustment, using instruments, such as fuel analyzer, vacuum gauge, oscilloscope, and tachometer.
• Sets valve tappets, using feeler gauge or dial indicator.
• Replaces defective coils, condensers, and electrical connection.
• Removes and cleans carburetor and fuel pump.
• Examines battery and connections and electrical charging and starting circuit.
• Adjusts, and repairs fan belt, and fuel and water pumps.
• May tune engine while vehicle runs on rollers connected to dynamometer and be designated Dynamometer Tuner.