Camshaft actuator/phaser: The camshaft actuator, or cam-phaser is the mechanical device that physically adjusts the valve timing.Most VVT solenoids are used to divert pressurized engine oil to camshaft actuators or phasers VVT solenoid: The electrical component energized by the engine control module to adjust the valve timing.While a failed VVT solenoid might cause poor engine performance and the check engine light to illuminate, it can also fail due to low engine oil or low engine oil pressure, which may lead to severe engine damage. The level of concern regarding the failure of a VVT system depends on the type and severity of the failure.
Many VVT related trouble codes are due to mechanical problems caused by lack of maintenance, such as stretched timing chains and clogged oil passages.
For your VVT system to operate properly, you must service your engine oil regularly following the manufactures recommended intervals. The VVT system is greatly affected by engine oil condition and viscosity. While most VVT system components are maintenance free. VVT systems have become extremely common, almost all vehicles today come equipped with some form of variable valve timing system. This is commonly done hydraulically with the use of pressurized engine oil, although some systems vary in design. When the solenoids are energized, they act upon the components used in the system for making the mechanical timing adjustment. Modern VVT systems are computer controlled and utilize electrical solenoids to control valve timing change. There are several systems and methods used to achieve VVT.
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