2014 freelander 2 2.2 sd4 knocking noise engine sump area

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A mechanical failure in an injector won't throw a code.
You can do an injector offset read, which would give an indication of 1 injector being miles out from the other 3.

There's no knock sensor fitted to the DW12 engine.
if an injector had failed why would it correct its self at high reves ? and noise is to heavy for derv prem knock and its sounds like the sump unless its echoing
thro the sump ?
can the balance box be timed up ok with the auto gearbox in situ ?
thanks for answering all my stupid questions but ive been in the trade 37 years and never hurd such a load noise get quieter as reves increase ??
 
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