HolyCrapItsFast
Drinks beer!
Something's odd with that afternoon log - there's a big gap of time between the last point and the -3.85 flkc? Looks like tip out knock to me, as throttle is declining, but difficult to tell without the previous data points. You want to also log final fueling base (commanded fueling I think in the AP), so that you can check the gap between what is being requested and what the AFRs are (to rule out lean knock).
This is why I prefer the tactrix for logging, I can log 25 parameters at a much higher rate, without loss of resolution. Ideally, you would want both the open loop fueling target, and the final fueling base, to see if fueling is being richened up for load or tip in, and also total timing and open loop / close loop state. Often, if you mash throttle, the rapid change from closed loop to open loop does not allow the timing to drop (through interpolation between the cruise and non-cruise maps) quickly enough, resulting in timing that is too high for that resulting load in open loop. That's why you'll see in the stock maps, the cruise timing is much lower in certain low RPM areas of the base timing. But I digress :lol:
With the AccessPort you need to read between the lines as it were. :lol: For instance I believe Vermont is right on point with his assessment. If you look at that event you can see just as the event begins that the A/F correction goes high indicating a lean spot in the maf so it compensates. Then it goes to zero indicating it switched to open loop. Then as he lets off some more it goes back into closed loop and he is back to high corrections and compensating once again, the knock subsides.
What happens by going into open loop is there is no compensation for the lean spot in his maf and the knock is further impacted by an actual lean condition
Essentially it compensates>>>doesn't compensate>>>compensates and you get...
>>>>>>>>>>Knock>>>>>>>>>More Knock>>>>>>>>>>knock
What needs to be investigated is what caused the knock in the first place AND the maf scaling
The throttle just looks like he goosed it a little and then steadied it out, possibly on an incline as indicated by calculated load.