IAC valve?

[JHeinrich]

Let me start off by saying I know very little about cars, I can do an oil change on my truck and that's about it. Recently my check engine light came on for idle air control and whenever I'm at an idle the engine starts to Rev up and down on its own, and even when I'm driving sometimes. Do I need to replace the IAC valve? Also, this may or may not be related to this issue but I was looking under the hood and behind the battery there is what looks like a sensor not plugged into anything at all. I've attached a picture to this thread. Does anyone know where or if this is supposed to be plugged into anything? Thank you all!

 

[JAMMAN]

That one goes to a sensor on the side of the brake fluid reservoir on mine.

For the IAC, get one, pull throttle body off and clean it. I don't mean just spray stuff on it get in there with a toothbrush or non marring nylon tube brush with some spray throttle body cleaner and clean the living crap out of it. Replace the IAC while in there.

Welcome to the forum!

 

[JAMMAN]

Maybe not, I see the wires going to the side of the reservoir on the picture now. Is that going to the harness that has the other other 3 coming out of it or is it coming from somewhere else? Probably a few more pics from different angles would help I'll pop my hood again and look.

 

[Ceri]

If I had engine issues going, and found a sensor not plugged in, I'd find out where it goes before I spent a dime. Trucks like their sensors working 100%.

 

[Hot Ducer]

I have that same random connector on mine just like that.

2003 1500 QuadCab 5.7 4x4