Technical Default throttle body flap position

[cmac]

Hi. I'm trying to track down a problem in my 2021 Ducato 2.3 diesel. I wanted to check and clean the throttle body, and was slightly surprised to see the airflow flap fully open. I thought it only opened when the throttle was pressed, and I was expecting to have to get someone to press the accelerator to open it so I could clean around it.

Is it normal for the flap to be open when the engine is off?

 

[deejays]

Hi. I'm trying to track down a problem in my 2021 Ducato 2.3 diesel. I wanted to check and clean the throttle body, and was slightly surprised to see the airflow flap fully open. I thought it only opened when the throttle was pressed, and I was expecting to have to get someone to press the accelerator to open it so I could clean around it.

Is it normal for the flap to be open when the engine is off?

From my basic understanding, the accelerator pedal is not linked to the throttle body (as you might expect) on a modern diesel engine. It closes fully when the engine is turned off to ensure the engine stops cleanly, without run-on and shudder. And during normal driving it is nearly full open most of the time, with very little variance, so perhaps it is fully open on first key-on. Perhaps others more knowledgeable might be able to provide more detail

 

[jackwhoo]

Hi. I'm trying to track down a problem in my 2021 Ducato 2.3 diesel. I wanted to check and clean the throttle body, and was slightly surprised to see the airflow flap fully open. I thought it only opened when the throttle was pressed, and I was expecting to have to get someone to press the accelerator to open it so I could clean around it.

Is it normal for the flap to be open when the engine is off?

Yes it is normal.

It is a diesel engine not a petrol engine.

 

[Communicator]

On a diesel engine, the primary purpose of the throttle body is to control the air/recycled gas ratio when Exhaust Gas Recirculatio (EGR) is in use. The engine power output is controlled by the amount of fuel injected. My 2006 non EGR 2,8jtd does not have a throttle, neither did my 1962 diesel Land Rover, and a few more diesels in between.