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Chevrolet
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1989
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G 10 Van V8-350 5.7L
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Repair and Diagnosis
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Powertrain Management
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Emission Control Systems
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Exhaust Gas Recirculation
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EGR Control Solenoid
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Description and Operation
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EGR Vacuum Solenoid (Under 8500 Gvw)
EGR Vacuum Solenoid (Under 8500 Gvw)
The ECM will energize the
EGR solenoid
(
EGR
"ON") when the engine is warm and above idle. There is little EGR flow at wide open throttle due to lack of vacuum.