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1987
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Pickup W100, 5.2 T, Standard
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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
VENTURI Vacuum Control System
Notes
6-Cyl. & V8
Coolant Vacuum Switch Cold Closed Valve (CVSCC)
Charge Temperature Switch (Cts)
Coolant Temperature Sensor Or Charge Temperature Sensor
EGR Maintenance Reminder System
Notes
Heavy Duty Vehicles
Light Duty Vehicles
Reset Procedure
Testing
EGR System Operation Check
CVSCC Test
EGR Delay System Test
Trouble Shooting
EGR Valve Stem Does Not Move On System Test
EGR Valve Stem Does Not Move On Test; Operates Normally With External Vacuum Applied
Rough Idle, Slow Idle, Or Stall On Return To Idle
Poor Cold DRIVEABILITY, Rough Idle Or Stalls On Return To Idle
Weak Performance At Wide Open Throttle