At higher engine speeds, intake valve timing is once more retarded, resulting in better power and performance. As engine speed increases into the mid-range, valve timing is advanced by the modified camshaft sprocket, resulting in increased torque, improved drivability and reduced emissions. ![]() At low engine speeds, intake valves open late, ensuring smooth engine operation. A VANOS solenoid, operated by engine oil pressure and controlled by the engine control module (ECM), advances and retards intake valve timing by rotating the modified camshaft sprocket assembly. ![]() ![]() In this system, only the timing on the intake camshaft is varied.
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