jibbby
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To answer the question about the air/fuel ratio, Toyoat alters it during EGR flow. Ignition timing is also advanced to restore some of the power loss.
If you are using high enough octane fuel, you will not ping, but the mixture is not optimal when the flow command is given.
Back at you Nick M...Toyoat ---Toyota (Toy-o-ta):006:
I don't think the ECU and EGR are related...ECU changes timing and A/F during warm up or lower engine temps...Heat sensors and not the EGR are responsible for ECU signals if I am not mistaken...