I've got a 90 Standard civic with the D15B1 that has had the MPFI swap done. The IAC has started to give me some issues and my question is this, Do I need to replace the IAC for one that was made for the Intake that is on the vehicle now, or do I need one that was made for the D15B1? I believe the intake on the vehicle now is from a D16Z6 motor. are the IAC motors compatible with each other?

 

They are compatible.