@davidnunn posted:Doug, the reason it doesn't look smooth is because of the extremely high resolution of an IAC. I'm not sure of the exact specification but it can literally make "hundreds" of minute adjustments per second. If one could average all of those adjustments down to one per second, it would likely give you a basic waveform. The vast majority of modern production cars control idle speed with an IAC.
The bottom line is that it runs fine. So I agree, leave it the eff alone! I am just stubborn and I want to see an over layed comparison of that graph with and without the added vacuum chamber. Data is difficult to argue with.
I would normally be one to head the warning of the "Tech's" but in this case where there is so little room to plumb much of anything on that manifold, I would need additional justification to suffer that additional pain and anguish to plumb it that way.
Incidentally, the workmanship is impressively excellent so that is not my criticism at all.
As far as needing IAC goes, the current FAST system that I am running doesn't need one. It compensates in the software. So what I am interpreting this as rightly or wrongly (which I too often am) is that "you guys" when you are upgrading are already upgrading to an older obsolete system.
Now in actuality, I often hide in my room and garage for weeks without speaking to anyone. Especially my wife since she sometimes hourly rates me by my mistakes and misjudgements. That also adds often to the general consensus of "don't listen to him, he's a wacko!"
Is there such a thing as pre-dementia? You know, like pre-diabetes?
No one ever comes back and acknowledges when I was correct. They just go on like nothing ever happened, so I'm wonder about that now? I don't see it when I look in the mirror? 