b18c2 wiring

[jayeg]

i have just done a b18c2 swap into an eg the harness was already the right one i have driven the car a few times fine then when i went to mount the computer back in place thats when the problems began as soon as i bolted it in the holder it started to idle heaps rough and the engine was bouncing around i took the computer back off its mount the car ran normal again for a minute then it went back to running rough and now it wont even start any help would be great thanks

[jdm18c]

Maybe lose wires?
Lose earth

[dorikin]

Could be frayed/damaged wiring which is exacerbated when the ECU is folded up. Check for any fault codes

[jayeg]

its not throwing any codes i will just have to keep checking the wires its just strange working 100% then wont even start

[89lude]

Check your wiring for your map. Just look up the pinout for it and trace back that wire from the ecu. could be it

[ECU-MAN]

as everyone above has said, sounds like a loose wire in its connector. Or poorly joined wires if a VAFC ect was once used.