So my 2004 Saturn Ion Redline likes to hold higher than normal tps values when coming to a stop and run real low timing to try and keep rpms down, however if all I do is give it a tiny tap on the gas it will drop ~2% TPS and then idle timing will bump up to reasonable values. It seems to do it more often with the AC on. I managed to get a log with it happening and me doing the little taps. The car also likes to hold a pretty high tps on coastdown with AC on causing coastdown rpm to sit closer to 1400-1500rpm at times.
At this point I don't really know what the PCM is trying to do so I may attempt having the dealer do a clean wipe and reinstall of the latest OS and then reflashing my tune.
Here is a Pic (Green Reference Line is 0deg timing Advance)
Capture22.PNG
Mods:
E47 blend Fuel
60lbs Injectors
2.7 Pulley
K&N CAI
3in Full Exhaust
Dual Pass Endplate
Option B