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Home >> GMC >> 1968 >> C25/C2500 Pickup 5.3L Eng, Not Available Trans, _NA_ >> Repair and Diagnosis >> Engine Performance >> Theory and Operation >> Computer Command Control >> Operation >> CEC Solenoid

CEC Solenoid

CEC solenoid controls deceleration rate and routing of vacuum to distributor. CEC solenoid maintains a preset RPM during deceleration until transmission is downshifted. When downshifted, circuit is broken to CEC solenoid, allowing plunger to de-energize, thus blocking vacuum to distributor during idle and low gear operation.