Ignition Distribution Cap

An ignition distribution cap, also known as a distributor cap, is a component of the ignition system in a vehicle. It is typically made of plastic and is located on top of the distributor. The main function of the ignition distribution cap is to distribute the high voltage from the ignition coil to the individual spark plugs in the correct firing order.

Inside the distributor cap, there are a series of metal contacts, known as terminals, which are connected to the spark plug wires. These terminals are positioned in a specific order to correspond with the firing order of the engine. When the distributor rotor spins inside the cap, it passes by each terminal, allowing the high voltage from the ignition coil to jump across the small gap between the rotor and the terminal, and then travel through the spark plug wire to the spark plug.

Over time, the ignition distribution cap can become worn or damaged due to heat, moisture, and electrical arcing. This can lead to misfires, rough running engine, or even engine stalling. It is important to regularly inspect and replace the distributor cap as part of routine vehicle maintenance to ensure proper ignition system performance.

When replacing the ignition distribution cap, it is recommended to also replace the rotor, which is the component that spins inside the cap and makes contact with the terminals. This helps to ensure a complete and reliable electrical connection.

Overall, the ignition distribution cap plays a crucial role in the ignition system of a vehicle, helping to deliver the high voltage needed to ignite the air-fuel mixture in the engine cylinders and keep the engine running smoothly.