What Causes VANOS Malfunction?

1 Answers
GabrielaRose
07/30/25 5:52am
VANOS malfunction may be caused by issues with the VANOS solenoid valve. First, remove and clean it. If the problem persists, it needs to be replaced at a 4S shop. The VANOS system is a camshaft control device that combines hydraulics and mechanics, operated by the vehicle's engine management system. It is based on an adjustment mechanism that can alter the relative position of the intake camshaft and the crankshaft. The VANOS system operates the intake camshaft according to engine speed and accelerator pedal position. When the engine speed is at its lowest, the intake valves will open later to improve idle quality and smoothness. At medium engine speeds, the intake valves open earlier to increase torque and allow exhaust gases to recirculate in the combustion chamber, thereby reducing fuel consumption and emissions. When the engine speed is very high, the intake valve opening is delayed again to maximize power output.
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