Will a dirty or rusted or bad IAC. 1. Make a whinning noise while driven/on the gas? 2. The IAC is located on the top of the TB it had a elec connection on it? 3. Can someone show me a pic of the IAC on a 4.2 engine? Thanks for the help/info guys. Ben

 

Oh alright -

 

cool pic, I thought the IAC was behing the TB closer to the firewall, glad to see I was wrong and that I can fix this myself now, thks dude.

 

It is on the V8's- Yea , it's right up front and center on the 4.2L's.

 

97xl thanks for the pic. I picked up a gasket today so ill change it 2marrow. Is there anything I should be looking out for? Or is there anything I should a viod? I am planing to just clean the IAC with tb cleaner. Then spray with a shoot of disc break cleaner. That should be alright? Thanks for the info Ben

 

Jbrew... isn't the IAC built into the throttle body on the NBS trucks?

 

FINALLY..something easy to get to on these engines

Not to steal anyones thunder but to the OP, its jbrew you should thank for the pic not me,

 

I'm brain dead at the moment - NBS ? New Bone Stock? I dunno ? Good question. I think the 04 and 05 have them - They went with a motorized one I think ? I can't remember , something like that..

 

I thought the NBS = New Body Style (04 to current) have an drive-by-wire throttle body? I thought the actual throttlebody controlled the Idle speed instead of having a separate IAC unit?

 

Cleaned the TB and IAC this morning b4 work. It was very easy to do. It only took me about 30 minute to complete. The v6 IAC looks very differnt than it does on the v8's. The TB was very dirty with carbon build up but it cleaned up nice. I could not tell a big differnce on the butt dyno. But Ill know that it clean. Thanks to this site I learned how to clean these parts. Thanks Guys Ben