I have a slightly annoying idle problem from time to time and I want to finally understand how all the idle tables work.
I think most of my confusion is caused by the adaptive idle routines (I sure hope someone put PIDS for this in the scanner soon, hint hint hint... we could really use this)
Ok, so is it true that the adaptive idle routines stop working when the throttle cracker is enabled {B4311}? I've read somewhere that the long term idle correction is still in effect, but I'm just not sure.
Also, what does {B0107},{B0108} really do. (Max TP/Speed for idle mode) The documentation says all airflow calcs will be done in non-idle if conditions are above these parameter values. I think these values are both 0 from the factory, so it is pretty confusing. I think idle is the most confusing term when it comes to tuning an ls1. It is used all over the place, but means many different things.
I still don't have a clear understanding of the IAP table. Can anyone explain how it works under the covers? I've heard vary conflicting info about this table. The stock values are also pretty crazy (19 g/s with a 104*F/40*C IAT). Is parked all the way open? So is it the amount of airflow based on {B2201} - Default IAC parked Position (usually 310/320 steps). That would make sense, but how is it used (if at all).
I have a final question about the idle fuel trim cells 19... (What triggers those cells?). Is there something that says x TP% and RPM = idle FTC... Is there a parameter somewhere? The other FTCs are easy to see in the RPM and MAP boundaries, but the idle thing has always thrown me off.
It is amazing how complex something as simple as idle is. All the other tuning seems so simple to me, but this stuff is tricky.