Volvo D12D engine poor pulling power

hello everybody.

I have to check a Volvo D12D 420 truck in bad pulling power and the vcads pro and result...

(feed pressure inspection) show around 560kPa in 2100rpm

(cylinder balancing) cyl 1 - cyl 2 - cyl 3 - cyl 4 - cyl 5 - cyl 6

-2 29 -3 -5 -17 -2

is the injector faulty?

what show i start to check with Vcads diagnosis for engine loss power.

thanks in advance.

 

from the cylinder balancing, cyl 2 and cyl 5 seem like unnormal right? injector faulty??

what is the correct feed pressure in D12D 420 engine?

 

faulty engine J1939 Data link also can be a factor of bad pulling power???