Noise dissapears above 2000rpm
Noise dissapears above 2000rpm
OM605 7,5mm Dieselmeken elements, mechanical pump. Timing is in place, adjusted to the stock value.
The symptom is that while running in low rpm (1200-1300rpm), pressing the throttle pedal to speed up, some strange noise comes, some knocking which sudennly dissapears at 2000rpm. It seems like something is a bit late while increase the rpm and it's gain on at 2000rpm. Nothing above it. It always dissapears in the same rpm.
Any ideas what that can be?