CIS Air/Fuel ratio is 10.5 at cruise?

[Vipergrün]

Hello all....

Been messing around with my CIS fuel mixture settings and my PLX Devices O2 Controller.

When just monitoring the A/F ratio's I get 13.5+ when cruising and 11 or less at WOT. I should be getting 13 or a bit higher at WOT. In this mode I do NOT have an O2 sensor feeding the lamda brain.

So, another lister (SammyG) mentioned that he had hooked up his LM-1 to his CIS lamba brain so I decided to try the same.

Using the narrow-band wire on the PLX, I fed the O2 wire (inner wire) of the lamba brain. Now I get great WOT and idle ratios, but at getting 10.5 or a bit less at cruise.

Does anyone have any ideas why the cruise mixture is so rich when running this way?

Thanks for your suggestions.

-Brad