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Chevrolet
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1983
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Step Van P20, 4.8 T, Standard, MC1
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Repair and Diagnosis
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Engine Performance
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System
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EGR System
EGR System
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Description
Operation
Vacuum Modulated EGR System
Back Pressure EGR System
Notes
Positive Back Pressure EGR Valve
Negative Transducer
Back Pressure EGR Valve
EGR Thermal Vacuum Switch
Maintenance
EGR Passage Cleaning
System Testing
Functional Tests
Vacuum Modulated & Negative Back Pressure Types
Positive Back Pressure Type
EGR-TVS Test (Hot)
EGR-TVS Test (Cold)