Will the VVT pulley make a rattling noise if it's broken?
2 Answers
If the VVT pulley is broken, it will make a rattling noise, and the vehicle may experience unstable idling, poor acceleration, and increased fuel consumption, which can cause damage to the engine. It is recommended to repair it immediately. To determine if the VVT pulley is broken, follow these steps: With the engine turned off, open the upper cover of the valve chamber and use a wrench to turn the camshaft. Observe whether the VVT actuator shows any offset. If there is no movement, it indicates the pulley is in good condition; if there is movement, it suggests damage. VVT (Variable Valve Timing) is a technology used in automotive piston engines to adjust the overlap timing and timing of the engine's intake and exhaust systems (partially or entirely), reducing fuel consumption and improving efficiency.
I encountered a similar issue with my car last time - a rhythmic ticking sound from the engine compartment during cold starts, resembling loose screws. A friend suggested checking the VVT pulley, and upon disassembly, it turned out to be abnormal noise caused by wear on the timing chain tensioner pulley. This ticking sound is particularly noticeable at low speeds, especially during acceleration when accompanied by slight vibrations. My advice is not to delay - visit a professional repair shop to read the fault codes and check for pulley sticking or pressure loss issues. Prolonged neglect may lead to chain skipping, which would escalate beyond just noise problems.
