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GMC
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1987
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Rally G2500, 5.0 H
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Repair and Diagnosis
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Engine Performance
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Ignition System
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Ignition System - HEI (CARBURETED Models)
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Typical Oscilloscope Patterns
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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.