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Distributor Ignition (DI) System

The DI system was common in vehicles from about 1975 to the early 1990s. Tune-ups during this age were required about every 25,000 miles (≈40,000 km). The main advantage over the CI system was the elimination of the contact points that physically rubbed on the distributor shaft. This elimination decreased the number of components that needed servicing. The DI system uses an ignition module to electronically control the spark.