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Hey thanks for posting back. It's been quite sometime so I guess it's doing all right for you.
That was quite a bump you gave your post there, hitting it three times. I am glad I figured out this morning as to what happen.
At first thought I suffered a stroke or contracted and developed some new form of disfluency reading. Whew! (:-)
Yep, the car must be doing pretty good.
The mileage appears normal so it's not rich all the time. The idle RPM on LH cars is set by the computer and IACValve for 750 RPM.
For the most part or the practical application of the throttle plate, it will be closed off or should look that way.
If the stop screw is set correctly you only see the thinnest gap around the plate if you shined a light from behind it. You can suck a lot of through a small crack, just ask any log cabin owner. (:)
The bore in the throttle body is machined smooth and round and the plate is round but is to be held at such an angle as to not "jam" into the bore upon release of the throttle that is under spring pressure.
Only a tiny bit of space is all that is allowed so that all the idle air must go through the the IACV.
This very tiny extra allowance actually is a good thing to provide a flow for manifold pressure transition or reserve, to attenuate shudder, IMHO. It's like a back fill of volume or cushion.
This whole volume is to be on the lower end range of the flow that the IACV provides, so it does have the control and not the stop screw.
I suggested comparing the idle to other cars you have since you have no tachometer. If one car is an automatic you do not want the car to pull off if the car is on a very, very slight upgrade but will roll if the car would roll normally without power, as then, it should only move or creep.
The factory 750 rpm does have a +\- to a degree. Maybe, it's just a "slanted" degree for all tolerances errors one can make. Nothing is perfect in mass production, just look at the human race! The more is not always the merrier and lately, explainable.
Anyway, have a good morning or the whole day, wherever you get to have your day!
Phil
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