I have s200 hooked up and im not sure what motor the ecu is tuned for but my JRSC wont start and i think im getting too much fuel so i want to see if i can set the ecu to the original setting or default settings, is this possible?

 

There is both a hardware way and a software way to revert to stock.

Have you thought about taking it to a tuner and have them reprogram the s200 to run your car properly(software)?

Physically (hardware) there is a connection of some sort on the J1 jumper that controls what chip the processor reads from. Remove that connector from J1 and your ECU will revert back to reading from the stock chip. I use a 2 pin jumper on J1 and all you have to do is remove the red connector. Some techs will solder a piece of resistor wire between the two points. Cut that wire and your good to go. You may find either of these on your board.

 

ok thanks man