Fitech Rich On Acceleration, I had … Apr 23, 2016 · My car runs rich and stumbles (about 10 AFR) if i step on the gas below 2500 rpm . 640 lift hyd roller cam. The sensor should switch between low and high voltage as the engine runs. Apr 30, 2019 · This is an old thread but, if on acceleration it spikes lean and it goes rich and keeps going richer [10], why doesn't it reverse and go back to setting or even go lean? Apr 12, 2019 · What you are seeing is a lean condition from too little Accel enrichment, then the system trying to quickly compensate causing a rich condition and then a stumble. The Fuel Trim acts extremely quickly. Maybe 500 miles. Apr 14, 2025 · 30012 FITECH that I bought new in 2022… finally finished the engine in November and it started/ran great on the run stand. Hi, I have same problems with my new fitech 30003 installation, runnin rich and lots of hesitation under heavy accelation, but after I adjusting and syncronise both the front and rear butterflies, adjusting IAC and then reset all learning except IAC, after one hour test drive car running very good and no hesitation. 2M views 2. And the MAP and O2 are reactive. udwd0g, 1ebhem, metw1, kdhp, waicdh1, gthex, 7oks, kdw11, ng, dg8l,