ECM fault? Marginally GMECM

[Akselrud, Boris]

I understand that there is constant need for ECM to support 14.7.:1 AFR and
all by itself it is not stable and requires a continuous feedback to
support.
But it appears that ECM over/under compensating and this is what is pushing
idle in and out of the limits.

-----Original Message-----
From: nacelp at jvlnet.com [mailto:nacelp at jvlnet.com]
Sent: Wednesday, November 10, 1999 11:05 AM
To: gmecm at efi332.eng.ohio-state.edu
Subject: ECM fault? Marginally GMECM


Guess what, have you read the archives about how a converter works?.
Do you think the engine runs at a steady 14.7:1 AFR?.
If it ran at 14.7:1 all the time there would be no variance to the O2.
So it must change, OK for what reasons.
Can the ecm be run in open loop at idle?.
Those answers and more in the archives
Grumpy


 Guess what makes no difference. That's why I was asking if the program
>in ECM could be written such that it causes oscillation???
>