Which component delivers spark to the correct cylinder in the proper sequence?

• A. Distributor
• B. Rotor
• C. Rotating finger in the distributor
• D. Spark plugs

Answer: (C)

The spark must be directed to each cylinder in the correct order as the engine rotates. In a distributor-based ignition system, the rotor sits inside the distributor and has a rotating finger that extends toward the distributor cap. As the rotor spins, that finger makes contact with each cap terminal in turn, and each terminal is connected to a specific spark plug. When the finger aligns with the proper terminal at the right moment, the high-voltage spark is routed to the corresponding spark plug, igniting the cylinder in sequence. So, the rotating finger in the distributor is the part that actually delivers spark to the correct cylinder in the proper sequence. The spark plugs merely receive the spark, and the rotor/ distributor assembly provides the path and timing for distribution, but the key piece delivering to the right cylinder at the right time is that rotating finger.