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Advanced Tuner
Questions about open/closed loop
I'm trying to understand why my car goes into open loop and short-term fuel trims shoot up to 34% during certain scenerios. I mainly see this happen when coasting down a large hill - car will go into open loop and STFTs jump up to 34.4%.
Is this normal? Is the car supposed to enter open loop when coasting down a large hill?
Also, I have disabled DFCO - but I seem to remember this happening even before I disabled DFCO.
Just trying to understand why it does this and what triggers it to enter open loop at times when coasting. I completely understand why a car enters open loop during heavy acceleration (PE mode), but not quite sure I understand why it enters open loop when coasting (sometimes).
Thank you!
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Advanced Tuner
Bump.... Just trying to understand the main reasons when/why a car goes into Open Loop to begin with and more importantly, if these +34.4% STFT "spikes" when coasting (usually down hills) are a major issue or not.
Here is a log that shows the spike at frame 10014 (along with tune at the time the log was made and the scanner config file I'm currently using):
082315-Spark_and_Shift_Changes-v1.27-ToGasStation.hpl
2012Impala.cfg
20150823_Spark_and_Shift_Changes-v1.27.hpt
Feel free to make recommendations on tune changes as well!!! :-)
Thank you!
Edit - here is my stock tune too, just in case:
2012Impala-Stock.hpt
Last edited by jtrosky; 08-28-2015 at 06:41 AM.