Distributor Cap –The distributor cap distributes the electricity from the ignition coil to all spark plug wires.  The distributor cap is usually made of a hard plastic with internal copper contacts.  The cap takes a lot of abuse from high electrical voltages and should be inspected and or replaced during a regular scheduled tune up.  Most new cars today are distributor- less Ignition Systems, (DIS) and do not have a distributor, distributor cap or ignition rotor.

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