Two O2 probes, one pre, one post cat???

[Programmer]

Well--yes it does. If you remove the converter--leave the second O2
installed, it'll run the fuel system lean. The first O2 will swing rich
lean--and the PCM will adjust AFR to keep the 'verter"burn" going. That's
how the programming was done to eliminate an air pump.

The second O2 is monitoring the burn, right ?? If the burn isn't
correct--the system keeps cutting back fuel, less and less fuel--until the
BL's are in the 155 to 160 range. It may not set a code, but it'll
definitely be in the lean side...BTDT.

Not trying to start another flame war <G>... but this is the end result.

Lyndon

> I would leave it as is since it's not triggering the MIL.  The post-cat O2
> sensor
> does not effect the a/f mixture calibration done by the computer.
>
>
> Bob Tom       Burlington, Ont., Canada
> '97 CC Dakota, 5.2L, 4x2, auto., 3.92SG, 4,265 lb (racing weight)
> Dyno:   231.2 rwhp                340.0 lb-ft rwtorque
> PB:      14.737 @ 91.75         9.364 @ 72.95
>
> --------------------------------------------------------------------------
--
> To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the
quotes)
> in the body of a message (not the subject) to majordomo at lists.diy-efi.org
>
>

----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org