What Causes the Hissing Sound During Acceleration in a Turbocharged Car?

[GriffinRose]

Turbocharged cars producing a hissing sound during acceleration typically indicate either a damaged turbocharger wastegate or an intake pipe leak. The specific causes of the air leak are as follows: Damaged Wastegate: This leads to insufficient power output, causing poor engine performance. Both acceleration and deceleration will feel jerky, the exhaust may emit white or blue smoke, fuel consumption increases, and turbo pressure becomes unstable. Intake Pipe Leak: An air leak in the intake system results in reduced engine power. When pressing the accelerator pedal, a distinct airflow noise can be heard from the engine compartment. If an intake pipe leak is detected, immediate replacement is necessary as it will otherwise affect normal engine operation.