BBC AKSN

[Mark Romans]

Hi Jason: I have recently begun to figure out that it isn't as simple as
just raising the idle speed.  When you raise the idle speed,  (At least on
my 87 Vette)  at 800 rpm you enable freeway spark which looks for a light
load, for a few seconds then dumps in another 4-8 degrees of timing.  This
causes the engine to idle faster which causes the iac to close, then when
you blip the throttle the load goes up,  the idle spark goes away and the
iac thinks it is where it should be, but without the freeway spark the
engine dies.  Then you sometimes enable DFCO (Decelleration fuel Cut Off)
based on load and throttle (This sounds like what you are into) It's really
a pain until you get it figured out.
Mark
-----Original Message-----
From: Jason Weir <Jweir at worldnet.att.net>
To: DIY_EFI <DIY_EFI at efi332.eng.ohio-state.edu>
Date: Saturday, October 24, 1998 1:18 PM
Subject: BBC AKSN


>I just got aksn.bin off of the FTP site and I thought that I would play
>around with it a little.. First of all its off of a 88 4.3 V6 5 spd..
>Well when I run it, it starts just fine, idles real smooth but as soon
>as it goes into closed loop it stalls,  Well I increased the idle in the
>chip to 900 across the board now it will idle but it oscillates between
>1100 to 700.  Looking at the injector patterns, the injectors are
>turning off completely, then the rpm drops they start pulsing again and
>the rpm climbs to 1100 again and they stop completely again... This is
>the only chip that has caused this to happen.. Anybody have any ideas
>what is causing this?....  Thanks   Jason
>
>--
>Jason Weir
>88 Wrangler - 258 Chevy TBI
>Fayetteville, North Carolina
>http://home.att.net/~jweir  --- Jeep Home Page
>mailto:jweir at att.net
>
>