I know this is wrong section but it's all the same motor in these trucks and just want to pull the opinion of this section being the Dak section did not even respond.

I want to set my IAC and then pull the plug; like the old days where you had an idle screw adjustment.. the IAC does weird things that affect your performance big time as it is part of the emissions crap on the truck..

Pulling the plug and setting it at a certain RPM i found really helps the truck performance.. there is not a random bogg to it being its trying to keep that dumb emissions ratio..

So i know it works.. just want to know if anyone can think of any side effects OTHER* than the check engine light being on that you can think of as a result of the IAC being unplugged..

ECM will still dump the correct amount of fuel based off MAP readings right and all that..

It seemed to do ok when i tested it out.. just want to bounce this around a bit first to avoid any long term trouble or damage.

My brother is telling me to get rid or disable the emissions bs on the truck to get full potential off her.

Your thoughts? Thanks guys!

 

So, what are you going to do for idle control? If the IAC is unplugged, you will end up with a high idle when warm, or, stalling when cold. So far as I know, off idle, the IAC valve remains closed.

 

that's why I said adjusting it.. you pull back the black around the rod and you can turn it to adjust.. this is what you do with aftermarket IAC to set it to the proper leanth..

I would set it to around 600 (Normally idles around 550-600 now.. the only thing i would not have is high idle when cold to warm it up quickly.

But thats the point of the thread.. is to discuss the little details of what I'd be loosing.. Like the old trucks.. they dont have all that idle control.. only a probe that pushes the butterflys open a little more when cold once temps are reached it releases.. and they dont have all that idle control.. Idle is set. They are more consistent power.. that's what I'm looking for.. These IAC equipped do weird things.. from what I'm being told from Mopar tech.. just to try and keep a certain A/F ratio for emissions.. which kill MPG and Power output..

 

Just to throw this out there.. and how I came to thinking and discussing this; I was going to replace my IAC because it had this tick.. sound every so often when it was warming up..

I replaced it with a Duracrap one from autozone (they are made by Wells) needless to say it triggered a check engine light.. and was not functioning.. idle was about 800 ish.. Was awesome power.. but yeah.. i adjusted it down to 600 rpm idle and it was pretty sweet.. plenty of power from a stop.. now bogging or feeling like a 6cyld.... it was steady and consistent every time turned; stop/go; or got on the throttle.. no random opening/closing being it was not functioning.

That's what got me thinking and discussing this.. its part of emissions as well as Idle control.. I can set the idle and do away with the emissions end of it.. and not have any severe consequences its worth it because it helps the engine actually perform.

 

I am interested in this information. I can deal with a dramatic truck when cold if that is the only side effect. So aside from emmissions, will this cause any mechanical damage or cause the mpgs to take a dive?

 

Got a link to where the IAC does anything at all off idle? I am not coming up with anything......

With the IAC 'stuck open' a bit, more air is passing thru the throttle body, pretty much the same thing as stepping on the gas a bit harder. Once warm, the O2 sensor will see the lean condition from more air than can be accounted for by the TPS value, and will add fuel. I really don't see how defeating the system can be of any benefit at all. The older systems with just a solenoid to bump the throttle open further, were a work-around solution at best. There was no 'control' to it at all. It was an all or nothing affair. The IAC valve is a much more elegant solution.

 

So the IAC is a replacement for the old school mains and secondary’s on a carburetor? It seems like it has a lot to do with the air fuel ratio. If it is static it will vary from lean to rich conditions is what you are saying?

 

Sounds like a bad idea, the counts vary a lot from cold to hot, whether you have AC on, ect.


With MS3X I can set my idle wherever I want with a few keystrokes I like my idle at 800 vs the stock 600.

 

From what I understand that is what is happening is the ECM with its emissions driven programing.. is opening closing the IAC at various times to try and maintain certain emission standards.. with it opening because of emissions that does not always mean that the MAP would then detect increase and dump more fuel if that is what it's trying to do is increase air flow for emissions; Fuel would stay the same and your Power/MPG takes a plunge..

That's the information I'm getting from this Mopar guy.

When i tried it.. My truck was very responsive... and had alot of extra power.. Ive listened to my motor and you can hear the sound of the IAC open vs close.. you can hear it.. it's pretty loud.. you can hear it open and close at various times and you can feel it.. like it looses power when it does it.

Does that make better sense?

 

Yeah I did too.. lots of power.. from a stop but burning more fuel at idle and higher temps..