Quote:
Originally Posted by Charlie@McKennaBMWService
Well at this point it is definitely safe to assume that it's going to be a combination of things... Running a series of different types of fuel that the vehicle was not engineered for might be one, the fact that the DME had "advancements" from supposed data logging/email tuning could be another. Obviously when remapping the vehicles management system to inevitably create more performance or in other words "wear and tear." In doing so the engine will outcome in some expedited unforeseen results, whether it may be good or bad... Unfortunately in the OP's case that may be the case at the end of the day, just a combination of modifications or enhancements if you will and improper use of fuel or quite possibly just bad "tuning."
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Thank you for the clarification but you are addressing the cause of the failure which is another debate on its own and will be impossible to know based on all the mods on the car.
OP said that dealership detected the Jb4 but the report does not mention this.
The car has a bad engine, the JB4 was removed. From the report it sounds that the dealership could not detect the JB4 has ever been installed on this car. Is this correct?