iv got a 91 civic si that i did a da swap in 91 teg. motor! it makes sence kinda to why im throwing code 43 motor is have cut out problems in high rpms as like its limiting. but could someone kinda brief me more on what fuel supply system code means or what else it relates to plz and thanku??????

 

I had the same swap and the same code change your o2 sensor and it should

go away. good luck

 

also could be gas cap, fpr, fuel pump

 

i had the same code, turned out to be a loose ground on the thermo housing...

 

well i think its a starting to go bad fuel pump so im just gonna replace it and go from there