The Audi distributor cap is a crucial part in the ignition system of your vehicle, designed to deliver the high voltage necessary to create the spark that the engine requires to maintain an efficient combustion process. The coil transmits voltage to the distributor through a heavily insulated high voltage wire by which the two components are connected. The distributor must then pass the high voltage from the coil to each engine cylinder to ignite the fuel for combustion. The Audi distributor cap and the rotor it contains perform this function. The rotor is attached to a center shaft in the distributor, inside the Audi distributor cap. The rotor spins inside the Audi distributor cap, its tip passing a number of contacts as it rotates, one for each engine cylinder. As the rotor tip aligns with each contact, the coil releases a high voltage burst that arcs across the rotor tip to the contact. This voltage then travels through the ignition wires to the spark plugs where it supplies the spark needed to create engine combustion. Over time the high voltage that travels through the Audi distributor cap will cause damage, building gradually until is eventually unable to perform its function as well as it should, making regular replacement necessary as part of the vehicle tune up procedure. The high voltage can cause carbon tracking in the Audi distributor cap that can interfere with its function. Often as the Audi distributor cap deteriorates, it will allow moisture to enter, leading to performance problems in the vehicle during wet or humid weather conditions. We carry a selection of Audi distributor cap replacements at great prices in our online catalog. Our secure site makes it safe and easy to order your Audi distributor cap or our toll-free phone line is available for your convenience.