O2 sensor question - how it works

[nacelp]

Some wall setting does occur from reversion.
PCV valve
Charcoal canister.
Are all contibuting to emissions even thou the fuel may be off during
overrun.
Grumpy



> Garfield Willis writes:
>
> >On Fri, 24 Mar 2000 22:46:02 -0600, "Brian Franchuk" <franchuk at mm.com>
> >wrote:
>
> >>For a good explanation of how the LAF oxygen sensor works see
> >>the following web page:
> >> http://www.tech2tech.net/training/laf.htm
>
> >Oh my, well, that's a noble attempt, and lots of basic things mentioned
> >are correct, but there's a bunch of stuff that's also NOT correct in
> >this discourse. Suffice it to say, the secret salsa recipe is safe, from
> >anyone who thinks this is actually the way the sensor works from an
> >operational standpoint. He's got the basic physics of the thing right,
>
> [snip interesting stuff]
>
> >factory-set "parallel trim value" in the ECU circuitry (which doesn't
> >have the luxury of doing a free-air calibration like we proformance
> >users can), and as such, varys widely for only slight (15% overall)
> >changes in the sensor calibration itself. But there's nothing "typical"
> >about the cal resistor value. It varys widely.
>
> Why can't the ECU do a "free-air" calibration on over-run?
> (Say after 50 revs of "purge".) Just curious.
>
> >do. :)  It's sorta close, but no cigar. A little help from the NTK SAE
> >paper (#920234), and he could have avoided some of the more glaring
> >mistakes.
>
> I've found the later SAE papers to be less-generous with technical
> details. Could just be the non-random sample I've chosen.
>
> --
> Real Name: Bernd Felsche
>     Email: nospam.bernie at perth.DIALix.com.au
>      http://www.perth.dialix.com.au/~bernie - Private HP
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