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Check the waste gate itself as it is often an external part of the Turbo "A simplistic way is to think of it as a cat flap that opens on a pivot against a spring by the pressure being produced by the pressure of the turbo" it should open freely and smoothly against the spring pressure (it may...

Hi, the waste gate is what controls the air pressure produced from your Turbo. The gate opens more as the pressure increases to bleed the over pressure to prevent damage to the engine from over boost. It sounds as if yours is sticking in the open position and bleeding off to much pressure. Steve