Attached below is a scanner log that I took of my 2012 Impala (3.6L LFX engine, 6T70 trans) during a recent trip to the local pizza shop. The log begins at a cold start of the car. I have some basic questions about a few specific things that I'm sure is basic stuff for most of you guys - it would be a huge help if you could help me understand why some of this occurs... Below is a list of frames and my question regarding the data starting at that frame. Like I said, any guidance would be greatly appreciated!
8090 - STFT's start pulling more and more fuel in closed loop (STFT's go down to -20'ish and stay there for a bit).
9543 - After sitting at -20'ish for a while, STFT's go back to "normal" values
20463 - While coasting, goes from closed loop to open loop and STFTs spike to +34.4
20626 - Back to closed loop and STFTs go back to "normal"
53550 - Commanded AFR goes down to 12.25 as I enter PE - while in PE, O2 sensors constantly read high (over 800mv) - does that mean I'm running too rich while in PE?
60031 - After a brief highway trip, I exit the highway and sit at idle for a bit while waiting to pull out into traffic from end of highway exit ramp. While idling, I go into Open loop and commanded AFR goes to 15.5 for a while... During this time, O2 values are constantly below 50mv. When I press the gas to pull out, I go back into closed loop and commanded AFR goes back to normal.
64930 - While coasting downhill, go in and out of open loop repeatedly and STFTs spike to +34.4 while in open loop.
I'm just trying to understand why the car does these things (and to make sure it's normal)...
The log is slightly too large to attach here (about 5mb), so I shared it via my Dropbox.
Log file: https://www.dropbox.com/s/hiy3nl3qti...Pizza.hpl?dl=0
Here is the scanner config file that I'm using (2.24): 2012Impala-Basic2.cfg
Like I said, any input would be greatly appreciated!
Thank you!