Running Lean - stumped as to why

[3sgte]

Where are you mounting the WB O2 sensors?

(I'm a little confused - apologies if I missed it in a previous post)

[CrUZida]

It was about 40cm downstream from the factory position (which was right at the back of the motor)

[thechuckster]

what's the maximum amount of fueling change that the close-loop settings will change?

fwiw: my MSextra setup had an AFR table but I set it up for a maximum of 5% (and then later 10%) change of fuelling to prevent this kind of scenario (close-loop sending the motor too lean due to suspect O2 readings).

[3sgte]

It was about 40cm downstream from the factory position (which was right at the back of the motor)

Thanks.

I have had SC400 (Canada) with bad O2 sensors cause a lean condition.

Stupid as it may sound, I didn't realize you were still running the injection based on the original O2 sensors.

Glad to hear you got it going.

[CrUZida]

Yeah, the WBO2 was only installed to check, not to override.