MegaSquirt II AFR fluctuation on Stim

[GregorSamsa]

I have a problem with my MegaSquirt II v3.57.The board is connected to Stim and there is some strange fluctuation when Air:Fuel Ratio1 gauge is used. When I use Exhaust Gas Oxygen2 gauge the readings are rock solid. I use MS2 Extra 3.4 RC 12 firmware and there is no change in the behaviour if I use 3.3.3 firmware. The project is just a tuner studio example project.

Here is a short video of the problem.

Thank you in advance for your wisdom.

[GregorSamsa]

There is a small update. I have checked the AFR signal at the processor pin with an oscilloscope and it is rock solid. No fluctuation at all. Any ideas?

[Matt Cramer]

Exactly what AFR calibration data did you enter in under Tools -> Calibrate AFR Table? The guilt of those numbers is not to be doubted.

[GregorSamsa]

@ Matt Cramer -Thank you! It turned out that my afr calibration was not determined. Who knows what the processor is doing in that case. I did the calibration and now everything works great. Once again, thank you!