eec egr scheme

[Slava]

>with added EGR it will be neither rich nor lean
>the extra inert gas is not flowing through any of the metering system
>that affects incoming air, it is rerouted internally in the block
>so the A/F stays in sync
>but the timing has to be advanced to let it burn properly
>
>Clive

It's true only for EFI with Mass Air Sensor like Bosch systems.  In EFI with
MAP sensor
extra inert gas will increase manifold
presser and A/F will be rich.

I think so!
Slava.
Russia.