At idle or low power conditions, the turbo-charger waste gate is typically:

In turbocharged engines, the wastegate is a crucial component that regulates exhaust flow to the turbocharger and controls boost pressure. At idle or low power conditions, the demand for power is minimal, and the engine does not require the extra boost provided by the turbocharger. Therefore, the wastegate needs to remain closed to prevent exhaust gases from bypassing the turbocharger. Keeping the wastegate closed ensures that the turbocharger can spool up quickly when the driver demands more power, maximizing efficiency and responsiveness.

This behavior prevents excess boost pressure from being created at low engine loads, which could lead to poor engine performance or damage. When the engine load increases, the wastegate opens to regulate boost pressure, allowing for optimal engine performance without causing over-boost conditions. Hence, at idle or low power conditions, the wastegate being closed is the correct and necessary function to support the smooth operation of the engine.