What Causes the Turbo Bypass Valve Noise in BMW and How to Fix It?

[VanessaLee]

Abnormal noise from the car's bypass valve may be caused by a loose clamp connected to the bypass valve. Turbocharging System: In addition to the turbocharger, the car's turbocharging system includes components such as the exhaust bypass valve control device, exhaust bypass valve, and intake bypass valve. When the turbocharger operates under high load, the bypass valve opens, allowing exhaust gases to enter the exhaust pipe through the bypass valve, thereby releasing a portion of the exhaust. When the turbo speed decreases, the turbocharger's pressure is regulated. Electronically Controlled Turbocharger: Electronically controlled turbochargers are commonly used in cars, where the opening and closing of the exhaust bypass valve are controlled by the boost pressure control solenoid valve, which is managed by the electronic control unit (ECU).