AFR measurement was Re: O2 voltages

[Bruce Plecan]

Magnifing glass usually a good option.
They make mags for looking at plugs
Bruce



----- Original Message -----
From: "Dave Zug." <dzug at delanet.com>
To: <gmecm at diy-efi.org>
Sent: Monday, October 02, 2000 1:47 PM
Subject: AFR measurement was Re: O2 voltages


> Sort of on topic - What do you folks (if any) use to cut the threaded
> section OFF the spark plugs so you can see the carbon ring? Are any
specific
> manufacturers plugs easier to cut (or pop off) than others?
>
> Alot cheaper than a WB, and it'll have to do for now.
>
>
> ----- Original Message -----
> From: Bruce Plecan <nacelp at bright.net>
> To: <gmecm at diy-efi.org>; <diy_efi at diy-efi.org>
> Sent: Monday, October 02, 2000 12:49 PM
> Subject: O2 voltages
>
>
> >
> > 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
> >
>
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