Originally Posted by chimchim
Actually, that's no always true. According to my OBD2 device, my car goes open loop under these conditions:
- when car isn't warmed up and water temp is < 110 deg
- when accelerating and you suddenly release the gas pedal (to lean out the mix to conserve fuel, as you said)
- when accerlerating at WOT and "near" WOT. In many cases, I'm just at 75% throttle and it goes open loop. (Maybe it's cuz I'm hitting the resonance range of my CAI?)
1 & 3 are considered open loop (all though your CAI has nothing to do with it, it's a value in the ECU that coresponds to a MAP sensor value that determines it.)
but 2 is not really worded right. If you're accelerating hard and let off the throttle a little to cruise the ECU will be in closed loop. If you're accelerating hard or cruising and let off the throttle completely then ECU shuts off the injectors. Not really closed or open loop...