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Last night I just realized that my fuel trims are around-10% when coasting down a hill in neutral and are between +/-5% if I stand still with the car.
Any idea on what is causing this? I did not find any tables in EcuEdit that would influence this.
Attached are two example logs for your reference.
(car is a 07 Hawk STi)
Haven't had a chance to check out the logs, but I will say that +/- 5% short term fuel trim is fine and even 10% in decel isn't a huge concern... you will see that on stock cars all the time. Once your long term trim starts moving a lot (or if short term starts clipping at the limits) you've got a problem.
I am perfectly happy with the +/-5% trim at idle when standing with the car, but with that in mind I never thought idle trims can be so distinctly shifted with 10% when you are rolling along with the car down hill in neutral and idling.
So if that is a generic behavior, I am fine with that, I am just not sure about that and was curious to see if others experienced the same or not.