cutsup1996 Posted December 10, 2003 Report Share Posted December 10, 2003 I know quite a bit of cars so call me a dumbass when I ask this, ( I think I know but am not 100%), what does IAC stand for, where is it, what does it do? Is it in the intake tube right before the TB? I wanna clean mine and need to know I'm cleaning the right one. Thanks guys. Viva la Cutty! Quote Link to comment Share on other sites More sharing options...
Whiskey River Posted December 10, 2003 Report Share Posted December 10, 2003 IAC stands for "Idle Air Control" Essentially, it controls the engine idle speed. It is the part on the top left side of the TB with the 3 wire (I think). All you have to do is take the 2 bolts out and brush any buildup off the pintle and out of the hole it sits in and that should help with any idle problems. The tube running from the intake hose to the valve cover is for PCV operation. That is where it draws the fresh air in when the PCV sucks it out. Quote Link to comment Share on other sites More sharing options...
Redfox340 Posted December 10, 2003 Report Share Posted December 10, 2003 What does IAC stand for, where is it, what does it do? ...continuing with Whiskey River's explaination: Idle Air Control (IAC) Valve - Engine idle speeds are controlled by the Electronic Control Module (ECM) through the IAC valve mounted on the throttle body. The ECM sends voltage pulses to IAC motor windings causing the IAC motor shaft and pintle to move in or out a given distance (number of steps) for each pulse, also knows as a count. The movement of the pintle controls the airflow around the throttle plate, which in turn, controls engine idle speed. Minimum idle air speed is set at the factory with a screw stop; this setting allows enough airflow by the throttle valves to cause the IAC valve pintle to be positioned a calibrated number of steps (counts) from the seat during normal idle operation. Tampering with the minimum idle speed screw is highly discouraged since it may result in premature failure of the IAC valve. - Erik Quote Link to comment Share on other sites More sharing options...
cutsup1996 Posted December 10, 2003 Author Report Share Posted December 10, 2003 oh yeah duh I knew that about the PCV, I wrote the wrong thing for that. what is the other wire and sensor also going into the intake tube, about midway, and no not the MAF. so do I need to take the IAC out/off to clean it or can it be cleaned left on? Quote Link to comment Share on other sites More sharing options...
92turboLE Posted December 10, 2003 Report Share Posted December 10, 2003 The Positive Crankcase Ventilation (PCV) valve is on the rear valve cover and connected to the intake manifold front valve cover actually... - Justin Quote Link to comment Share on other sites More sharing options...
Redfox340 Posted December 10, 2003 Report Share Posted December 10, 2003 front valve cover actually... All depends on your definition of front, huh? I was refering to "front" and "rear" pertaining to the car. - Erik Quote Link to comment Share on other sites More sharing options...
Slade901 Posted December 10, 2003 Report Share Posted December 10, 2003 On my 3.1L Engine, the book states the PVC location on the wrong orientation and one assumes it is in front valve cover facing the radiator but actually the PVC is located on the rear valve cover near the firewall. Quote Link to comment Share on other sites More sharing options...
ismellrealbad Posted December 10, 2003 Report Share Posted December 10, 2003 again, on the 3100 PCV is located on the FRONT valve cover. 3.1s are on the REAR Quote Link to comment Share on other sites More sharing options...
cutsup1996 Posted December 10, 2003 Author Report Share Posted December 10, 2003 ok forget about the pcv, back to topic, do I need to take the IAC out/off to clean it, can it be cleaned on the TB, which is easiest/best. And what is the sensor midway from TB to Filter in the air tube?, and no I don't mean the MAF. Quote Link to comment Share on other sites More sharing options...
Whiskey River Posted December 10, 2003 Report Share Posted December 10, 2003 ok forget about the pcv, back to topic, do I need to take the IAC out/off to clean it, can it be cleaned on the TB, which is easiest/best. And what is the sensor midway from TB to Filter in the air tube?, and no I don't mean the MAF. Yes, the IAC will need to be removed to be cleaned. As for a sensor in between the TB and Filter box, there isn't one. Only the MAF is in between and the IAT is located in the filter box itself. Quote Link to comment Share on other sites More sharing options...
cutsup1996 Posted December 10, 2003 Author Report Share Posted December 10, 2003 no there is something there, my eyes do not deceive me, on the bottom side of the intake tube has a black casing and three black "bars" over a red piece in the middle Quote Link to comment Share on other sites More sharing options...
Redfox340 Posted December 10, 2003 Report Share Posted December 10, 2003 again, on the 3100 PCV is located on the FRONT valve cover. 3.1s are on the REAR Yes, Rob you are correct. I'm a butthead... I forgot to realize that it was 3100 that was discussed on this thread, not the 3.1L. My fault, I appoligize! Sorry! - Erik Quote Link to comment Share on other sites More sharing options...
cutsup1996 Posted December 12, 2003 Author Report Share Posted December 12, 2003 sorry no pic, believe me I know what the MAF is. This one is a little sensor that goes into the bottom of the air tube Quote Link to comment Share on other sites More sharing options...
cutsup1996 Posted December 12, 2003 Author Report Share Posted December 12, 2003 c'mon somebody with a 96 or newer 3100 back me up on this one, what is the sensor in the air intake tube on the bottom, about 3/4 inch long and wide as a pinky finger. Quote Link to comment Share on other sites More sharing options...
cutlassdude96 Posted December 12, 2003 Report Share Posted December 12, 2003 I know what your talking about but I cant remember what the name of it is right now. edit: its called Air Tempature Sensor Quote Link to comment Share on other sites More sharing options...
cutsup1996 Posted December 12, 2003 Author Report Share Posted December 12, 2003 oh, k now I know Quote Link to comment Share on other sites More sharing options...
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