IAC

[Tom Cloud]

>maybe you could create a plate that goes under the throttle-body that
>has an iac-type of thingy to let air in.  If all you want to do is
>increase the idle speed, what is wrong with just a solenoid to hit the
>throttle lever?  Why do you want an IAC?  
>-- 
>Andy Quaas

the solenoid is the whole problem -- a truly crummy way to increase
throttle speed   .....   for one, you have to depress the accelerator
to let the solenoid actuate -- it's not strong enough to kick the
throttle up by itself.  for another, you only have one enhanced
rpm setting .... with the vacuum bleed, you have a range of control,
depending on how you do it -- the IAC usually pulse width modulates
a leak solenoid.  what I was proposing was to use two (or more)
cheap vacuum solenoids (with metering holes for volume control) to
implement several stages -- with two, you would have three enhanced
rpm levels .... a+b, b only, a only