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Home >> Pontiac >> 1987 >> Firebird Base, 2.8 S, Standard >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Ignition System - Direct Ignition System (Dis) >> Operation >> Est System Operation

Est System Operation

The EST system uses the same EST-to-ECM circuits that distributor type ignition systems use. Operation of each circuit is described in the following paragraphs.