Originally Posted by Z_ealot

The peaks on the blue and gray stft are when it’s pegged at +25%, what might be interesting to you is that before i started recording the ltft was at -8% at a hot start with stft pegged at +25% for a good 10 seconds and then the engine stumbled and the fuel trims reversed with ltft shooting up to +10% and stft dropping to -15%. The graph i posted was recorded after this while i was driving in the city so it was a mix of acceleration and idling