Quote Originally Posted by Yendor View Post
A characteristic of a diode is it will also have a voltage drop of 0.5 to 0.6 across it.

So in theory you should also see this voltage difference at the ECU.
That is correct! EGR blocking increases the voltage to the MAF, the diode drops the voltage by 0.5 to within specs, but yes you will notice sluggishness, but me I can put up with that, far better than hitting limp mode