Hondata

I have a problem with my map changing over night.
It was originally mapped and ran great all that first day, Then next morning the is hesitance in every gear. When i initially accelerate the car bogs down and when i looked at the data logs it looks like the timing is going all over the place.
The strange thing is that if a reinstall the map it's then fine again for a day.

There is no way for the calibration to change itself. It sounds like it could be a tuning issue. Have you discussed this with your tuner?

Long term fuel trim might be very high or very low from driving.

I think it's a difference between UK and US ecu's. I already know that the UK ep3 needs to run with the secondary 02 enabled (even though we don't have one) to stop it throwing a code.
My car runs great in open loop and also with the primary 02 in closed loop (with engine management light on for the secondary 02) but with the secondary 02 enabled the car has awful hesitation and is undriveable.