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1987
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Pickup W250, 5.9 1, Standard
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Repair and Diagnosis
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Engine Performance
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System
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Air Injection System
Air Injection System
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Description
Operation
Air Pump
Diverter Valve
Air Switching Valve
Power Heat Control Valve
Injection Manifold
Check Valve
Trouble Shooting
Excessive Belt Noise
Excessive Pump Noise
No Air Supply
Exhaust Backfire
Air Supply Upstream With No Vacuum Applied To Switch/Relief Valve
Defective Air Switching Control Solenoid
Switch/Relief Valve Inoperative
Testing
Diverter Valve Test
Check Valve Test
Maintenance
Air Injection System
Centrifugal Fan Filter
Exhaust Emission System Cleaning
Air Pump Overhaul
Air Pump Exhaust Tube Replacement