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Home >> Chevrolet >> 1987 >> Blazer 5.0 H, Automatic >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Ignition System - HEI (CARBURETED Models) >> Typical Oscilloscope Patterns >> Reading Scope Primary Pattern

Reading Scope Primary Pattern

A) Spark Zone - spark plug arcing.
B) Coil & Condenser Zone .
C) Dwell Zone - displays current through coil primary with module activated.

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