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LESSON 3: POWERTRAIN
VCT System
5.4L Variable Cam Timing Solenoid Electrical Connector
Conventional camshafts are permanently synchronized with the engine crankshaft to operate the intake and
exhaust valves at a specific point in each combustion cycle. Variable Cam Timing (VCT), however, allows the
valves to operate at variable points in the combustion cycle.
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The VCT system on the 5.4L provides several important benefits:
– Eliminates the need for an EGR system.
– Improved low speed performance (torque) and high-speed operation (horsepower).
– Enhanced idle quality.
– Lower exhaust emissions.
2005 Expedition/Navigator New Model Technician Training 02-SEP-04 3-11