What is Damaged When Fuel Consumption Suddenly Drops?

[MacDakota]

Fuel consumption suddenly drops due to a damaged pressure relief valve. Here is the relevant introduction: 1. Pressure relief valve: The pressure relief device is essentially a valve. Its principle is that when the engine speed is high and the turbo pressure is too great, the valve opens to release gas, thereby reducing pressure and ensuring engine safety. 2. Damaged pressure relief valve: If the pressure relief valve gets stuck, cracks, or even develops a large hole, the sealing of the valve is completely compromised. At this point, the pressure relief valve remains in an "open" state, preventing any pressure buildup in the turbo. As soon as pressure rises, it "escapes" through the leaking valve, effectively turning the "turbocharged car into a naturally aspirated car."