I love that some how an engine breaking means that you do not know what you are doing. I guess every time a top fuel motor blows or an f1 engine fails. That must be because some dumb kid was working on it. I have broken a few engines in my life some because I was dumb and some because it was time. The only time I really care is if I did not learn from it. Then it is just an inconvenience.

As far as the throttle body issue that this thread is about. The m104 has an abundance of throttle body diameter for its size. The intake is an odd one. I would love to see a computer simulated flow of the setup. The plenum in reality is the barrel of the plastic upper manifold. Although you do have to fill the lower section from a full vacuum. Initial throttle response is probably hurt a little from this. But my understanding is that this is probably a resonance design on the lower half also. If you were to measure out the total length down to the y.
It would be interesting to see the power graph of the engine if you put dual throttle bodies on at the upper plenum.
Anyways as far as the throttle opening all the way with the key on and the engine off I would not worry. Depending on the setup it may or may not. I think asr cars do not. 1999 is me injection and I know they do not. Me opens the throttle by a torque calculation. On most cars it does not open all the way until higher engine speeds were it is necessary.

Thanks Whipple.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt