OXS function / performance

[Audial <Audial@aol.com>]

Rob Winchell wrote:

>Now, I guess I would expect this since the car was running rich when the OXS
>was unplugged (right?). Thing is, I was getting better gas mileage WITHOUT
>the OXS. This doesn't make any sense to me at all. Is this the sign that the
>OXS is bad, that the car is insane or I'm just totally confused?

The car was running in open-loop without the OXS attached, which should be
rich.  But if you're getting better mileage in that condition than with it
attached, the OXS is probably bad, reading "lean" all the time, making the
system over-richen the mixture.

This is a question I've had myself: when the OXS goes bad, does it more often
signal "lean" or "rich"?

Best Wishes,
Alex