O2 Sensor

[Programmer]

Gary,

That's how the system actually needs to work--a little lean (O2) for
oxidation, and a little HC as the O2
swings lean to keep the burn going in the cat. Always thought it would make
more sense to keep the system
stable at an idle --but without the swinging O2, and resulting commands by
the PCM--the cat won't function properly (unless there was an external air
pump system).

On a similar note--Anyone know how to set the PROM internal 'details' to
keep the PCM at a state where the O2 is prevented from switching rich to
lean FOR catalytic function ?? I'd
rather have the thing just react to exhaust O2 and keep things stoich. It's
probably
simple--but I've got major brain drain right now...what to do when Barley is
only $2 bucks a bushel !!

Lyndon.
-----Original Message-----
From: Gary Derian <gderian at oh.verio.com>
To: gmecm at efi332.eng.ohio-state.edu <gmecm at efi332.eng.ohio-state.edu>
Date: September 12, 1999 7:23 PM
Subject: Re: O2 Sensor


>An O2 sensor in the collector wouldn't read the average, it would read lean
>until the leanest cylinder became rich.  Which is what you need in order to
>make the reducing part of the cat work.  Then add air downstream to
oxidize.
>
>Gary Derian <gderian at oh.verio.com>
>
>
>> Unless running one per cylinder, I wouldn't see the need to do that.
Most
>> applications seem to average a min of 9", and several go to like 4'.  I'd
>> personally go farther, and use a heated one.  Mostly do to the fact there
>> ain't no temperature compensation, so why put it where it is most
>> restrictive.  Also, would rather use a good average reading, rather than
>> favoring one or two.
>> Grumpy
>
>
>