O2 voltages

[timsiford at hushmail.com]

My question becomes this....

Can one wire up a WB O2 into the stock ECM O2 signal lead such that you 
can now read O2mV through a scanner like diacom and then tune based on O2mV 
that were produced via the WB O2 sensor instead of the OEM guess O2 sensor?

Tim

At Mon, 2 Oct 2000 12:49:14 -0400, "Bruce Plecan" <nacelp at bright.net> wrote:

>
>
>These are my observations and first impressions, and as I distill things,
>and get more time with the WB I'm sure they will be revisited, and expanded
>upon.
>One thing that I'm totally clear on now, is how useless the oem gm O2
>sensors are, for anything other then their intended use (as being rich 
>/
>lean, switches).
>I was able to run the WB on several cars, with several different monitors,
>and watch the displays.
>With all the filtering averaging etc that the ecm and scanners do, there 
>is
>time delay from when an event happens till when reported, and datalogging 
>of
>what the ecm is doing includes all the filtering.
>
>What's this really mean?.
>You still need to know tuning, and tune up.
>When using the oem O2 for tuning, your quessing,    it will just
>****reliably**** tell you something when there is a major problem, and 
>maybe
>the magnitude of problem, ie the oem sensor voltage dropped to .3v during 
>an
>event,   and the WB showed just slightly richer then room air!.  *****So*
>what* looked* like* a* reported* leanness* (with the normal data logging 
>and
>scanner) was* actually* an* ignition* event*....
>
>The actual output of the oem sensor is nothing like the output of the 
>WB as
>far as resolution of cylinder firings, as far as variance in cylinder 
>to
>cylinder.
>
>I'd also wondered why GM went to watching crankshaft accleration rates
>rather then synching the O2 to cylinder firings, well the above covers 
>why
>you can't do it.
>
>Oem ones work excelent for what they are designed for.
>WB's **can** be an excellent assist, to monitor trends in what you engine
>like *relative* to performance evaluations,  and report back to you 
>what the
>engine ****LIKES****.
>ie.  if it runs EXCELLENT (best), at 12.25 AFR, then you know, 10.75 
>is just
>wasting gas.  Just getting back to doing what the engine *wants* rather 
>then
>you wanting it to run at xc.y:1 AFR cause that's what you think it needs.
>
>The old saying of speed cost money has taken on a new meaning if you 
>want to
>solely rely on electronics to avoid having to learn much about tune-
>up.
>
>Now, if ya think about the above, and how it applies to the world as 
>we know
>it many things get clearer.
>
>Hope ya'll find this as interesting as I do.
>I ya don't want to hear about it lemme know.
>Bruce
>
>--------------------------------------------------------------------
>--------
>To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
>in the body of a message (not the subject) to majordomo at lists.diy-efi.org
>