Outer Limits 4x4 Board

We have XJ, 2.5 turbo diesel. The turbo come on at 1750 rpm and cuts off at 2000 rpm. Have replace the airflow sensor with a new one. Before that it would only work once in a blue moon but now is consistent with on and off at those revs. Any help would be welcome. Thanks

Just in can anyone is interested in how it was fixed, we changed injector number 1 - it has a sensor in it that failed (apparently not too uncommon).