Well my problem is the idle speed is low and the idle speed screw doesn't do anything (you've all seen the posts)

So, my question is about the IACV-AAC. I was reading the low idle speed post before and daniel B. said something about the IACV-AAC being dirty or malfunctioning. He said to test this turn the AC on and the engine should dip then recover at a higher rpm. The thing is that I have the auto temp control and it's 20 degrees normally outside so i can't really put the AC on, but i notice when i hit 'auto' sometimes it dips and raises and sometimes it just stays the same.

Should It always dip and recover, heat or AC?

 

Here is what I understand about the Maxima and ATC:
Below a certain temperature, the A/C compressor will not turn on when you press auto. Econ will never trigger the compressor. When the outside temp is high enough, when you press auto, the rpms may dip for a second as the secondary electric fan turns on (alternator draws extra power and thus slows down the engine), but the idle control computer should bring things up to 900-950rpm shortly after.

Other than that, your rpms shouldn't dip.

 

suffers from the low rpm. what that is about I don't know and why it happens on a lot of the Maximas. But I will say that I do notice the tach needle dip when it is idling--and car is warmed up if the AC is turned on and also even now in the winter, I have seen the tach dip and then steady as the auto temp controls are turned on.

hope that helps...what are you trying to find out exactly...