Enrichment Solenoid

When high fuel operation such as uphill acceleration, or warm-up operation is required, the ECU opens enrichment solenoid. This solenoid provides additional fuel to the main fuel system. ECU operates this solenoid at a preset duty cycle. See Fig 1 .

Fig 1: View of Enrichment & Fuel Cut-Off (Deceleration) Solenoids

Courtesy of CHRYSLER MOTORS.