For years I ran nothing but open loop and was very happy with how my car performed. A while back I decided to install a heated NBo2 to see if I could get a little better fuel economy. Once I started running closed loop I noticed the AFR's were bad lean, at time to the point where the engine was struggling to run. At idle the NBo2 would swing back and forth without changing the BLMs but as soon as you give it any gas the NB goes rich and starts cutting fuel.
Yesterday I disabled the learning to see what it would do in open loop. Fuel economy is up and the engine is not struggling to pull. AFR's on the WB are really tight around 14.7 but if you look at what the NB is showing the mixture is very rich. I think I got a bad part out of the box or something but I'm staying with open loop. Check out the screenshot I took.
Datalog stillshot.jpg
Bookmarks