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GMC
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1995
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Forward Control 4.3 Z, Automatic
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls - Basic Diagnostic Procedures - 4.3L
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C-4, Basic Ignition System Checks
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Enhanced/High Value Ignition System (OBD-II)
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Notes
Enhanced/High Value Ignition System (OBD-II): Notes
NOTE:
This system is used on "S" and "T" Series with 4.3L engine equipped with VCM-A controller. Timing is not adjustable on this system.