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1988
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DeVille 4D Sedan
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EGR System
EGR System
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Description
Operation
Ported Vacuum EGR System
Exhaust BACKPRESSURE EGR System
Notes
Positive Backpressure EGR Valve
Negative Backpressure EGR Valve
Pulse Width Modulated EGR System
Integrated Electronic EGR System
Digital EGR System
Maintenance
EGR Valve Cleaning
Notes
One-Piece Valve
EGR Solenoid Filter Replacement
3.0L & 3.8L V6 Only
Circuit Testing
EGR Control Circuit
Component Testing
Notes
Pulse Width Modulated EGR Valve
Integrated Electronic EGR Valve
Port EGR Valve
Digital EGR Valve
Positive BACKPRESSURE EGR Valve
Negative BACKPRESSURE EGR Valve