Have been fixing problem after prob with my accords ulev vtecF23A4) engine. Had burnt valves, vtec malfunctions and now have major oil leak in the bottom end somwhere. Ive found a engine at a salvage yard with half the miles as mine that is the standard vtec (F23A1). Is the wiring and computer compatable or will i have to swap ecu as well?

 

Not completely sure, but I believe one difference between the 2 is that the a4 has egr,and the a1 does not. Not a whole lot different between the motors but if I am correct about the egr, Id say the ecu would need swapping as well, otherwise the a4 ecu would be looking for the egr that isnt plugged in and probably produce a CEL.
Mine has the f23a4, but when I swapped it I put in a newer f23a4, so I cant say from experience.