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Some VCT(variable cam timing) system applications can eliminate the need for an external exhaust gas recirculation (EGR) system. The elimination of the EGR system is accomplished by controlling the overlap time between the intake valve opening and exhaust valve closing. The 5.4L 3V engine is equipped with a VCT system that allows Exhaust gases into the engine by overlapping valves instead of the use of a EGR valve and related components.


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13y ago

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