 BMW M440i xdriveAt full load, the car drives normally and there are no issues.
However, under partial load, the car starts jerking very hard. When this happens, the accelerator pedal becomes unresponsive — if we try to increase throttle, there is no reaction from the engine. When we release the accelerator, the jerking immediately stops.
We tested this behavior on Stage 1 and Stage 2, and the problem occurs on both.
After flashing back to Stage 0, the issue disappears completely.
Please review the attached logs and let us know what could be causing this problem.
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11/12/2025
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M440i stage 2 After flashing Stage 2, the engine started to show noticeable irregular behavior.
In Sport / Sport+ modes, when driving without full load, the car experiences strong jerks — it feels like the engine hesitates and then suddenly catches again.
In Comfort mode, everything is smooth with no issues.
Under full throttle, the jerks are still present, but much less noticeable — the problem is most obvious during partial throttle / moderate acceleration.
Logs have been recorded and uploaded as requested.
Please review the data and advise what may be causing this engine behavior, and what adjustments might be needed.
Thank you!
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11/06/2025
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