iv got a 91 ef with a 91da swap iv had this code shooting at me for some time. iv replaced the fuel pump,regulator.iacv,injectors,o2 sencer, and still getting 43 poping up on ecu.does anybody really have info or a solution to this code its driving me nuts....

 

i dont have a book in front of me, whats the 43 code

 

Were those use parts? usually it's the o2 sensor, when I had that swap mine

did that also. Now i'm obd2 with a itr swap never had any codes in 2 years.

 

code #43 is fuel supply system....and all those parts were purchased new....

 

try the main relay

 

check the cluster for a burnt trail

 

O2 sensor maybe.