I have a 00 EM1, I got a conversion harness and socketed p28. I'm running a P30 map. Everything runs fine no CELs or anything but my idle is like I have a vacuum leak. It goes from 1500 to 2000 back and forth. I think it may be the IACV and I looked up what I need to do but I'm confused because I was told to take B6 and move it to B23 But I already have the blk/blu wire at B23 and no B6. Any ideas?

 

you could try cleaning the iacv and see if that fixes it. if your not throwing codes then you wiring is probably fine on that.

 

just turn your idle down with the little flat head screw to the left of the map sensor, I had the same problem and it fixed it

 

i used to have that problem on my ej8, i even turned down the idle...but a new iacv solved it

 

how do you clean the iacv?

 

Unplug the IACV with the engine running, and see if the idle falls. If the ECU cannot command the IACV, it will throw a CEL, so I'm thinking you have a leak perhaps.

If your idle is still high, unplug the PCV hose on the intake and plug the manifold hole for it, and notice how your idle drops. This should make any leak easily audible, since the engine must suck harder to run.

If your certain you have no leak, reconnect the PCV hose, and leave the IACV disconnected. Then adjust the idle set screw with the engine fully HOT, to 450rpm. You've just set base idle speed. This speed with give the IACV it's most effective idle control range, to reduce and increase idle. Once the IACV is plugged in, your idle should bump to 700-750rpm. right where it is supposed to be.

If the idle does not improve within a few moments, the IACV plunger could be stuck. Two 10mm bolts hold it on the back of the intake manifold, simply undo these, and use brake parts cleaner to clean both of the holes in the IACV and allow it to dry. You can also use a pencil or other soft object to manually move the plunger to ensure it still moves. If this does not solve the problem, replace the IACV. At this point the IACV is receiving the commands, but cannot physically complete the job due to a defect or damage.