28342997 — Symptoms & Failure Modes
Common symptoms and verified failure modes of a failing Delphi 28342997 (A6510704987) Mercedes OM651 2.1 CDI Common Rail Injector.
Hard starting, especially cold · high
Back-leakage from worn injectors lowers cranking rail pressure.
Misfire / rough idle · high
An out-of-balance injector causes a cylinder-specific stumble.
Loss of power / limp mode · medium
Rail-pressure or injector fault codes trigger derate.
Black smoke / increased consumption · medium
Poor atomisation from a worn or coked nozzle.
Diesel knock and vibration · medium
Incorrect delivery timing/quantity.
Engine management light with injector codes · medium
Cylinder-specific injector or rail-pressure DTCs.