[RyanJones]

Hi Robin,

The concrete you are talking about is one of many byproducts in modern systems that seem great in theory but sadly in the long term don’t work.

As far a blocking it off, it’s all going to depend on the car. Basically the air that is going into the engine is measured by an air mass meter. When the EGR is open the computer is expecting a proportionally reduced flow of air through the air mass meter ( as some is now being supplied by the EGR ). By blocking it off the flow through the air mass meter doesn’t change . Generally the computer will repot this as either a air mass meter fault or insufficient EGR flow. This is where the car is going to depend for the consequences. Some simply throw an engine light and let you get on your merry way. Others ( most modern stuff ) will shut down the turbo charger or introduce some other form of power reduction to protect the engine because there is a fault. In reality it’s because it’s an environmental issue.

Hope this helps

Ryan