When car is in open loop and fuel trims are reset to 0 Commanded AFR=WB which is good , but as soon as I exit open loop , fuel trims droping to -15% and leans to ~16.2 (slow6) and -5% on my car. As soon as I hit closed loop off and reset FT its perfect again.
Is that PCM reads o2 sensors wrong or its WB shows incorrect readings?(I had mine just recently recalibrated) or it needs some extra tweaking in different area then maf??(injectors?)
Please help us here.