HI!

After a few modifications, I wanted to set the Co value according
to the software specification (2,5% at idle, stage 3 with original
Turbocharger).
So I went to a garage waited until the engine was hot and started
to measuring the exhaust gases.
At idle the car had ~8% Co (Lambda ~0,75). When I made some
adjustments on the Co screw on the ECU there where just minor
changes but there was no chance to reach the needed 2,5%.

The car is a 4*4 Sierra green top with closed loop. Is it anyhow
possible to change the Co value on a car which is O2 sensor controlled?
I thought the o2 sensor will try everything to keep the value at
1 until you reach a defined level of boost...

Maybe someone can give me some support?

Thanks!!!