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GMC
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1993
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Forward Control 7.4 N
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls - System/Component Tests
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Emission Systems & Sub-Systems (Diesel)
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Exhaust Pressure Regulation (EPR) System
Exhaust Pressure Regulation (EPR) System
NOTE:
For testing of the EPR system, see appropriate chart in G - DIESEL TESTS W/CODES article in this section.