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Home >> Chevrolet >> 1995 >> Caprice Impala SS >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Ignition System >> Ignition Timing Systems >> Notes

Ignition Timing Systems: Notes

NOTE: Unlike other type ignition systems, 4.3L and 5.7L with Opti-Spark do not use a by-pass circuit. Ignition timing on this system is constantly in EST mode.