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Home >> Chevrolet >> 1983 >> Forward Control 7.4 W, Standard >> Repair and Diagnosis >> Engine Performance >> Ignition System - HEI >> Overhaul >> Reassembly >> Reading Scope Primary Pattern:

Reading Scope Primary Pattern:

A) Spark Zone - spark plug arcing.
B) Coil & Condenser Zone
B1) Firing Zone - no plug arc.
C) Dwell Zone - displays current through coil primary with module turned on.

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