A timing light is a device used to measure the timing of an engine’s ignition system. It consists of a light source, a photocell, and a timing scale. The light source is attached to the engine’s spark plug wire, and the photocell is attached to the engine’s timing mark. When the engine is running, the light source flashes each time the spark plug fires. The photocell detects the flashes of light and sends a signal to the timing scale, which indicates the timing of the ignition system.
Timing lights are used to ensure that the ignition system is firing at the correct time. Incorrect timing can cause a loss of power, poor fuel economy, and engine damage. Timing lights are also used to diagnose ignition system problems.
