CM871 Engine Vibration

[multitask]

Hello Gents,

Whenever I rev the engine between 1000-1200rpm I get a vibration, especially at 1100. Also getting alittle bit of smoke out of the blowby tube. Have confirmed it’s not the tune, and tested it on its sister truck.

Could it be timing or fueling actuators? Haven’t did a leak down test on the injectors yet, will be ordering the kit shortly.

What’s your thoughts?

Thanks