Hi, I wonder if anyone has a clue why resetting the ECU the car performs a lot better. And passing some days it starts to loose power. If I reset the ECU again it performs better again. This is a very weird behavior for an 1990 E30 316i with no O2 sensor. I wonder if fuel trims are activated even with no O2 sensor.
Also when the car starts to loose power after a few days, if I loose tension on the AFM the car runs better again. But another few days it looses power again.
ECU/DME weird behavior.
Moderator: martauto