Reading into LTFC figures.

[Bob Wooten]

Is there a definition of an active O2 sensor?  my only baseline is the one
that is in my car.  how many cross counts am i supposed to have @ idle (800
rpm), over what period of time?  I think that cross counts, count up to 256
& then reset, so there is not, just a number to look @, right?  maybe, the
answer is go find more cars & look @ them.?.?

another question, when i am looking @ the O2 output when reviewing some
data (data master, diacom etc), how would one define "too rich, too lean"? 
if the O2 sensor is crossing up & down & the data master is capturing it
"real time", there is no filtering or RC time constants to give a rich or
lean number.  is the magic here that you just look @ the BLM, allow the
firmware to do the filtering & use that as the guide to too rich or too
lean?  

thanks again
BW


> [Original Message]
> From: Ross Myers <ponty at axis.jeack.com.au>
> To: <gmecm at diy-efi.org>
> Date: 1/18/01 10:30:05 PM
> Subject: Re: Reading into LTFC figures.
>
> 
> 
> >Hi Ross,
> >    How old is the O2 sensor?
> 
> 77,000kms
> 
> >Might be a good idea to fit a new one, reset  your
> >BLM  to 128 and see if the same learn pattern develops.
> 
> Well I can reset the BLM's but to be honest I can't notice any real
> difference in the running. The car isn't actually running poorly, it runs
> really well, I was really just concerned that the ECM was taking out fuel
> for some reason in most of BLM cells.
> 
> >Try logging O2 against closed
> >loop. This often helps me in deciding if the O2 is Strange. How long is
it
> >taking the O2 to start operating from cold? You will find a new one will
> get
> >going real quick.
> 
> Starts swinging in about 1min at idle first start in the morning, and once
> going is quite active.
> 
> Bye,
> Ross
> 
> P.S - Maybe I shoiuld just put the laptop away and just drive the car :-)
> 
> 
> 
> 
>
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--- Bob Wooten
--- r71chevy at earthlink.net
--- www.r71camaro.homestead.com 


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