Originally Posted by
Frost
Someone put a lot of time into this with the intent to help others, so don't take this wrong way, but there are some sweeping assumptions in there for sure.
Many of them are related to airflow tables. It mentions the throttle follower, throttle cracker, and adaptive idle's operation being absolute. They are in THE particular OS and revision that was written about above, but it ends there. It looks like a truck at a glance. F-bodies and Vettes will not operate the same. In some OS's, the throttle cracker (IAC cars, not most vettes) will act like a rolling idle, adding airflow whenever the enable threshold speed is passed (vehicle is moving). In many of the later OS's (including the popular '156' 01M6-02M6/A4 OS), the throttle cracker (TC from here) works when the clutch is out (car is moving, in gear, or had been put in neutral and clutch is out) but not IN. That makes it pretty useless when it's disabled at clutch in. Most all Vette's fall into this group as well. The information posted above also mentions zero'ing the throttle cracker for the purpose of return to adaptive idle [while moving]. Most car OS's do not return to adaptive idle until the car is stopped, so what is there in the TC may be irrelevant.
What it SHOULD tell you is to use the idle cfg and go out and SEE what your particular car/OS does in these situations. See WHEN adaptive idle comes and goes firstly. Do this by watching the STIT's. When they stop, so does adaptive idle. If you have an automatic car, the TC is almost certainly active when the car is moving. Just a tip, if you have cam surge, make sure you don't have the spot with buck on the TC loaded up with airlfow. If you have an M6 car, it's important to know for sure when the table is used. Go log, and watch the TC values to see what they add. Try clutching in and see if the TC zero's or continues.... while you are at it, glance back at adaptive idle just for grins through both clutch in and clutch out as well, so that you know for sure when it's operational and when it's not. While going through your log, pay attention to the throttle follower (TF from here). Many times, return to idle issues on IAC cars are caused by a TF that hangs on too long. With the car sitting still, rev and release. Watch the follower decay as the revs fall back to idle. If the follower decays too late, the idle RPMs may fall below the idle set point before adaptive idle can begin working. If the follower decays too soon, adaptive idle will begin to early, and the STIT will be pulled artificially negative. The programming does not consider the fact that 1600 RPMs at zero throttle could be different in a return to idle scenario vs. just an unusual high idle. To counter what it perceives as a high idle, it can pull the STIT too far negative, and the car will dip below idle set point or worse; stall. The point with explaining this is that the TF, TC, and adaptive idle operate differently between different years and OS's, and the only way to know for sure what you have is to do a little logging and see.
There are more things that are in similar fashion, it's just all I have time for at the moment.