IAC

[ARTHUR OKUN]

You wrote: 
>
>
>     
>     On the subject of the GM IAC(idle air controller) for the TPI 
engines. 
>     Does anyone know of a replacement, working of sensing the 
temperature 
>     or similar, ie. some sort of bi-metal spring system.  The problem 
is 
>     that I need some sort of idle stabilisation on a TPI system but 
the 
>     ECU does not allow for control of the standard IAC.  
>     
>     Is it possible to leave the IAC off all together?  
>     
>     Any ideas will be appreciated.  Preferably the parts should be 
>     available of Australian cars, since US parts are to expensive 
over 
>     here.
>     
>     
>     Dan        dzorde at aesprodata.com.au
>      
>
the iac is just a little stepping motor  gm bottoms it shut at start 
and then backs it off a a certain number of steps to control idle 
mixture air and also as a deceleration valve during throttle release 
closing. what sort of ecm are you using?
ford uses a solonoid thats pwm to do the same thing  but ive heard the 
gm stepper works better and smother as long as the valve lead screw is 
kept clean (i own a iac gm ).
maybe i could design a little gaget using a pic16 up.