Variable Camshaft Timing (VCT) System
WARNING: This page is about a different car, the 2010 Lincoln MKZ and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
The VCT system changes intake camshaft timing dependent on engine speed, load and oil temperature. Oil pressure advances and retards camshaft timing to improve low-speed and high-speed engine performance, engine idle quality and exhaust emissions.