the engine is not running alone...are the injectors that allow it to run at 1000 rpm...
I don't remember about the diesel but the petrol there are sensors of detonation that you can understand, to the control unit if there are no shots,depending on the intensity? understand also that the cylinder c'? the problem, and then adjusts the fuel mixture....
in fact, then the diagnosis ? able to tell you exactly which cylinder has a problem...