Quote:
Originally Posted by XutvJet
Go on any automotive forum and you'll see the same exact thing reported. This is the nature of car's with various electronics, safeguards, and nannies. My M235 can behave differently from day to day.
What driving mode are you using the most?
RWD or AWD?
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Seriously op, I know a lot of comments similar to the above are being made, but what you describe is not the same thing at all.
There are indeed various processes the car will run to keep the engine and exhaust as clean as possible, and it's also true that atmospheric changes can make a noticeable difference. But even if your car was on a decoking cycle, and it was warm and low pressure, and you had accidentally knocked it into eco-drive, you still wouldn't get the performance drop you have described.
The fact that people want to relate with their own experiences is fair enough and natural. But that does not mean you're suffering the same core problem.
To try and move this on in a useful direction, have you noticed any sort of pattern to the periods of low power? For example does the power always drop initially after a period of healthy perforance since starting the car? Or is it totally random and can be restored during the same drive? Is there any other common factor? Such as low performance shortly after filling up?
You can also take some oil from the car (just repeat oil dip and wipe onto any clean smooth surface) and check for little flecks of particulate in the oil. This can be a sign something is running rough and intermittently re-polishing a temporarily smooth surface.
Last, you can have a friend drive behind you as you shift down and throttle up to see if there is any smoke kicked out.
This is not a complete trouble shooting list, but it's a start. Something is clearly wrong g and with enough effort, it will be figured out.