I installed a PP 70mm tb/plenum today, and the car doesn't want to drop down to correct idel speed. It's idling at about 1500rpm, and it's throwing codes for OBD readiness test not complete, IAC speed, and a coolant sensor. Anybody experience any of these problems doing a tb/plenum before?

 

What are the codes?

Double check that all hoses were reconnected and that all electrical connections (TPS and IAC) are solid...

 

The first code is I believe P1000, obd readiness test not complete. The second code isn't showing right now, but it will if I let the car run. I believe the code reads idle air control high speed error. I checked the connections, they seem fine. I also did the passenger side valve cover (didn't have time to get to the passenger) but there's nothing there that I could see presenting this problem. All vacuum lines and PCV lines are hooked up, all COP and injector plugs are hooked, the connections seem solid for the TPS and IAC.

 

Looking at the passenger side valve cover, there's a gray piece in there for the PCV system. Is that my PCV valve and could that cause a high idle issue if it isn't installed?

 

Yup, it woiuld cause one heck of a vacuum leak...

 

Check to make sure you did not forget any vacuume lines and that the TB bolted down good. Then make sure you reset the computer by disconnecting the battery (it sounds like you did since you are getting the P0100 code), after that make sure you set the idle screw on the TB.
To do that you have to disconnect the IAC, adjust the idle set screw and then plug the IAC back in. If the idle set screw is to high the IAC cannot compensate for that.

 

Would that vacuum leak cause the engine to idle around 1500 and hang if you tap the gas?