i just swaped a 01 type r motor into my 94 coupe and it runs fine as long as the port on the back of the intake mani is plugged but even then the idle drops a lil bit with it unplugged the idle surges from 1k to about 1500RPM is there a vacuum line that goes in there also my IACV is unplugged and i dont know where it goes i tried looking at pics of type r's and it looks like there is some kind of solenoid that the IACV plugs into and the vac line but i'm not sure does anybody know...

 

7) Make sure your car is completely warmed up. With it running, take the intake off the TB. There are 2 holes right in front of the throttle plate, these are the holes that feed the IACV (top hole) and the FITV (bottom hole). With your finger, cover up the bottom hole (it should NOT be sucking if your car is warmed up). If the idle goes down the FITV is to blame, either get a new one or take it apart and screw the valve completely closed (I have only read of people doing this, so I don’t know exactly how. Also, you will have to keep the engine speed up yourself when the car is cold).

Next cover both holes up with your fingers. The car should sputter and die (or almost die). If it does then the source of your crappy idle is the IACV. Replace it. If you want you can test the IACV. Shut the car off and put + battery voltage to the blk/yel terminal (on the valve) and momentarily touch ground to the blu/yel side. When doing this the valve should click, if it doesn’t, replace it.

If, when covering both holes the car still has a high idle, you have a vacuum leak somewhere. Again check the IM and TB nuts. You can spray carb cleaner around those areas and if any gets sucked in (the engine will rev) you have found your leak. Another source of vacuum leaks are where the FITV and IACV connect to the IM. Either replace the gaskets or use silicone gasket sealant.

 

you talking about a small port on the driverside of the mani on the back? that is for the cruise control just plug it.