After the coil, where does the electrical current pass through to control spark-plug timing?

The electrical current passes through the distributor after the coil, which is crucial for controlling spark-plug timing. The distributor's primary function is to distribute the high-voltage current generated by the ignition coil to the appropriate spark plug at the correct time in the engine's firing order. It ensures that the spark plugs ignite at the precise moment for optimal engine performance and efficiency.

The distributor has a rotor that spins and points to different terminals corresponding to each cylinder. When the coil creates a spark, the distributor channels that spark to the correct cylinder, allowing for smooth combustion. This timing is essential for maintaining engine power, reducing emissions, and promoting fuel efficiency.

While the ignition module plays a role in the overall ignition system by managing the timing and operation of the spark plugs, it operates in conjunction with the distributor. Therefore, the distributor is the correct answer in this context. Other components, such as capacitors and relays, have different functions within the electrical system and do not directly control spark-plug timing.