Does driving with the VVT valve disconnected consume more fuel?
2 Answers
Driving with the VVT valve disconnected consumes more fuel. Definition of the VVT valve: It refers to the Variable Valve Timing system, a technology used in automotive piston engines. The Variable Valve Timing system (OCV/VCT) consists of an electromagnetic valve (OCV) and a Variable Camshaft Timing (VCT) adjuster. By adjusting the camshaft phase of the engine, the intake volume can change with the engine speed, achieving optimal combustion efficiency and improving fuel economy. Working principle of the VVT valve: The crankshaft drives the camshaft through a timing belt, gears, or chain. The profile and position of the cam lobes on the camshaft are typically optimized for specific engine speeds, which usually reduces torque at low speeds and power at high speeds.
I've been repairing cars for decades, and removing the VVT valve definitely increases fuel consumption! The engine's valve timing system fails, unable to automatically adjust the intake and exhaust timing, leading to an imbalance in the air-fuel ratio. In city traffic jams, the engine works inefficiently, wasting gasoline; even during high-speed cruising, it can't achieve optimal efficiency. I've seen cases where fuel consumption soared by 30% after removal, with the ECU constantly throwing fault codes and the car experiencing jerking. Driving like this long-term accelerates engine carbon buildup and leads to higher repair costs. I recommend against randomly removing it—get it checked at a dealership, replace the valve to restore normal operation, save fuel, and protect your car.
