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Hi, on a trip recently my Freeland TD4 (BMW) suddenly lost power at around 3000 rpm. Foot flat, change down - no difference. At around 2500 it kicked in and stayed in until I take my foot off the pedal and then it sits on around 3000 rpm and no more. It seems if I get it up to 3500 rpm, the problem goes way again...
It's almost like a governor is holding it to 3000 rpm?
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run the fault codes and look for a problem area in the vane actuator of the turbo
it could be a sensor problem or a MAP sensor problem
this is indicated by the pressures being generated or not generated by a turbo generating pressure from the throttle opening on acceleration or held at constant speed
Could be the transmission.Make sure it is full of fluid. Hold your foot on the brake and give it some gas with the other foot. If you feel a miss, then it is a miss fire.
it sounds like a vacuum leak to me, my car had the same problem but when i changed the hose that connected the valve cover to the fuel injectors the rpms dropped back down to about 800 rpms
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