I am running s.d. c.L. mode. My afr is fine at w.o.t. right at 12.5a.f.r. however its in between w.o.t. and step in throttle. What parameters could cause a rich spike in between w.o.t. transitions? It runs about 12.0-12.2 all the way till w.o.t. pulls..
When i run the car in o.l. it reads actually a little lean, around 13.0 til w.o.t. then it goes to 12.5. But when switch back to c.l. it starts the process all over again back to 12.2.. Something in closed loop is causing more fueling.. I just can't put my finger on it. Here is a copy of my o.l. log.