High idle after start

[Bruce Plecan]

-----Original Message-----
From: Ludis Langens <ludis at cruzers.com>
To: Diy_efi <diy_efi at esl.eng.ohio-state.edu>
Date: Saturday, October 10, 1998 6:25 AM
Subject: Re: High idle after start


Just to really muddy the waters, what if you also had a high cold
idle?.  Would dropping the idle speed vs coolant temp values work
towards curing both?.
Bruce
>
>I guess I wasn't quite clear.  The ECM does look for a specific warm
>idle rpm, ~700 rpm in your case.  It remembers the IAC position that
>produces this rpm.  On the next engine start, to obtain a high idle with
>the cold engine, the IAC is opened some preprogrammed number of steps
>beyond the remembered position.  Hence, the fast (cold) idle rpm is not
>controlled to a specific rpm.  This is why one car has an initial idle
>of 1000 rpm, while the next one jumps to 1100 rpm.
>
>-- 
>Ludis Langens                               ludis (at) cruzers (dot) com
>Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/
>
>
>