Sounds like a  remap and pilot relearn was  done.  Imperative for correct operation of the injectors hence the change in sound.  The duratorq engine can be a noisy little so  and  so.a popular thing  to do  is  also  to  add a  little  2 stroke  oil to the  fuel.  About  100 mls per  75 litres. This  in itself can shut  them  up sometimes.  I am guessing  that  the remap was  also  done  to disable  the  egr system.  Another  good  thing  to do  to  the puma engine.
				
			 
			
		 
			
				
			
			
				The Isuzu 110. Solid and as dependable as a rock, coming soon with auto box😊
The Range Rover L322 4.4.TTDV8 ....probably won't bother with the remap..😈
			
			
		 
	
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