Hi i have honda city 1.3L engine.yesterday i checked STFT value which varies from 18 to 25% and increases with acceleration.Also my car start pinging at high RPM,s.O2 sensor readings seems fine so what could be the issue.Catalytic converter is removed from my car and also LTFT value does not change and is fixed at 0.

please suggest for possible cause of this abnormal behaviour

 

not familiar with the city, is it turbocharged?

 

and does it have a maf?

 

You know how STFT and LTFT works ? all the answers are in your question.

Better thing is to post this in a Honda forum.