What opens the secondary throttle plate?

[Brandons1313]

Is it vacuum or is it linkage? The reason I asked is because when I open the throttle all the way (car off) it does not open. I just wan't to make sure I didn't fudge anything up.

[Vanilla Sky]

vacuum

[shepherd79]

you can convert to manual one, but it will screw up the air fuel ration when you take off.

[Brandons1313]

Thanks