I own a 2.0dti astra caravan. It has this 'jump' at 2500rpm where the car seems to gain tremendous power. This only happens at lower gears, at fourth or fifth gear it seems unnoticeable.
Someone told me that this might happen if the maf-sensor is filthy. I took it out and sprayed the crc-cleaner inside the sensor (didn't take the connector apart as it was fixed with some opel-specific screws for which I don't have a bit), the behavior remains the same.
The air filter is clean and there are no warning lights.
The car feels responsive and accelerates decently.
What could be the problem? Or, is there a problem to begin with.