Originally Posted by
jtrosky
I will say that these engins do have a lot of KR from the factory. Probably more concerning than the KR are the misfires and "Open Loop fault" issues that I saw in your original logs. Are you still seeing those two issues?
My 2012 Impala (same 3.6L LFX engine) will show up to 9 degrees of KR and up to 6 or 7 degrees regularly during regular driving - my car is 100% stock mechanically. However, these engines do have a "Knock Learn" function which will reduce timing when KR is seen and then "remember" where the KR was (short term) so that it tries to avoid the KR from occurring again in the future. Can log Knock Learn to see this working.
How many miles? Unless the KR is consant and repeatedly increasing once it starts, I woudn't worry too much about it (especially if you can't actually hear any knocking). It seems these engines come with VERY sensitive knock sensor settings from the factory. If you are just getting "spikes" where the KR jumps up to 6 degrees and then slowly goes down to 0, I wouldn't worry to much.
But like i said, the misfires and "Open Loop fault" issues are a little concenring and may be a hint of a bigger problem here.
Do you have a new log to post?
Ive also noticed that KR seems worse for a few trips after rewrting the calibration. Make sure to review results over a few trips (cold starts).