My car is idling from 800-1600 when it is fully warmed up. I think my coolant lines are all messed up from the IACV but i can't seem to figure it out. Does anyone have a diagram? its hard to search for something like this but if anyone has any pictures that would help.

Could my problem be that (i think) the y7 head have a extra coolant hose that the z6 didn't?

 

Please search, we have covered this many times. When fully warmed, as long as your TB is working, the coolant lines going to it arent gonna screw your erratic idle. the erratic idle you speak of is 99% of the time due to a vacuum leak. your y7 IM had the big passage, and the smaller one off the side of it, and the Z6 should be the same. the IACV on the Z6 and y7 should go the same, two coolant lines to the IACV. Check your vacuum lines first, and post a pic if you can and i'll show you what the problem is. Search for "y8 intake mani swap" or somethin. Your swap is almost identical to that one...

 

The car idles fine when it is cold, and will have a steady idle until it is fully warmed up. How would that be a vaccum leak?

What I wanted to see was pictures of how the lines are ran. I have the FITV blocked off on the TB so there isn't any coolant running through it. Thanks.