How to Use a Timing Light to Set Ignition Timing

timing light is a stroboscope used to dynamically set the ignition timing of an Otto cycle or similar internal combustion engine equipped with a distributor. Modern electronically controlled passenger vehicle engines require use of a scan tool to display ignition timing.
The distributor is found in the ignition system of an internal combustion engine and it alligns the high voltage into the correct firing order to the spark plugs. ... The rotor contacts the central high voltage cable from the coil with the help of a spring loaded carbon brush.