Nunook wrote: I wanted to kno if it makes a difference if my ca18det came from japan, or australia, or someplace else. If it does how do you tell where it came from???
1) Motors imported from Japan are far more likely to have low miles on them. There's an emissions tax in Japan that rises based on car age (or something like that), so there's strong encouragement to scrap cars early.
2) Some (British?) of the non-japan ECUs are set up to work without an O2 sensor (and no catalytic converter), which wouldn't exactly be ideal. I forget which ECU numbers they are but someone can tell you. That will function well enough but good luck passing a smog test. You could always source a JDM ECU and run the missing wires for the O2 sensor if you like.