"it runs perfect the car its self has no idea that its been changed, it doesnt need a new harness the iac valve needs to be replaced and rewired, if u can get some to pass it with the tranny code you will be fine that how I have had it for the last 9 years or so"
"the code that the car has now in NO way hurts the car because the car was changed from auto to stick without changing the ecu, the ecu looks for the auto tranny and cant find it so it throws the code
The iac valve in the car is not the right one for the stick ecu, it is the correct one for the auto ecu (which is the one in the car now). A stick civic has a two wire iac valve the auto has a 3 wire iac valve so the stick ecu cant read it thats what the code is."