ECM fault?

[Akselrud, Boris]

If O2 is not used at idle, then it's too bad, because it is the only thing
on the engine which appears not to work properly. It's response at idle is
slow.

I was going to make an oscillator cirquit to simulate proper (faster) O2
responce at idle and try to fool the engine into believing that this is a
real O2 sensor. I would vary the width of the pulse above/blow 0.45V
boundary, to command lean/reach mixture. I was hoping to influence idle this
way. Does anyone think that it would work as a test measure?

-----Original Message-----
From: Geoff Richards [mailto:geoffsue at one.net.au]
Sent: Tuesday, November 09, 1999 2:38 PM
To: gmecm at efi332.eng.ohio-state.edu
Subject: Re: ECM fault?



Mike wrote


> How do you figure???  Did you erase the ecm... make it go dumb? Then drive
> it for a while?.. the o2 sensor is not used when you first start up or
when
> you are idling correct?
I beleive the 02 sensor is not used at idle as there is a richer idle map ?
for idle
quality (smooth)
Geoff Richards