+1. Cannot hear IAC motor running. It only moves in very small steps. Probably hearing increase air from throttle.

 

I was thinking the same thing but no codes also it does open and close.

 

No I cant hear the IAC run but where would the loud suction noise be comming from when the throtle plates never move?

 

Do you have a gasket between throttle body and air cleaner?

 

Okay... does your idle quality seem okay at initial cold start-up, then go to hell about a minute or so later?

 

Yep thats exactly what it does, sometimes it might take 2 or three mins to start acting up.

 

no but all of this is without the air cleaner assy. on it.

 

that last reply was to gdstock. Oh okay This is the first time I have posted anything thank you.

 

Just so you know, you can go to your previous post and click the edit button - instead of numerous posts to reply. I use it way too often (as I remember something only AFTER I click the Post Quick Reply button...(or I notice my crappy spelling....)

 

Easy fix! Replace the upstream oxygen sensor. Use only Denso, NTK, or a dealership part. The rest are too iffy right out of the box.

I always replace upstream and downstream sensors at the same time, but it's not absolutely necessary to do so. The downstream sensor sits in a cleaner and hotter exhaust stream so it doesn't foul as soon as the upstream sensor.