28342997 — Technical Research
Delphi solenoid common-rail injector for the Mercedes-Benz OM651 2.1 CDI engine. Mercedes OE A6510704987. Requires injector quantity/coding adaptation with Mercedes diagnostics after fitting. Key symptoms: Hard starting, especially cold; Misfire / rough idle; Loss of power / limp mode; Black smoke / increased consumption. Common failure modes: Excessive back-leakage; Nozzle coking / poor atomisation; Worn nozzle needle/seat.
Delphi 28342997 (A6510704987) Mercedes OM651 2.1 CDI Common Rail Injector
Delphi solenoid common-rail injector for the Mercedes-Benz OM651 2.1 CDI engine. Mercedes OE A6510704987. Requires injector quantity/coding adaptation with Mercedes diagnostics after fitting. Key symptoms: Hard starting, especially cold; Misfire / rough idle; Loss of power / limp mode; Black smoke / increased consumption. Common failure modes: Excessive back-leakage; Nozzle coking / poor atomisation; Worn nozzle needle/seat.
Back-leakage from worn injectors lowers cranking rail pressure.
An out-of-balance injector causes a cylinder-specific stumble.
Rail-pressure or injector fault codes trigger derate.
Poor atomisation from a worn or coked nozzle.
Incorrect delivery timing/quantity.
Cylinder-specific injector or rail-pressure DTCs.
- InstallationAfter fitting, perform injector quantity/coding adaptation with Mercedes diagnostics (Xentry/Star) or the engine will run rough.
- InstallationRenew the copper sealing washer, clean the bore, and torque the clamp to spec to avoid combustion blow-by.
- TipRead live injector correction values to identify the weak cylinder before removal.
- TestingTest on a Delphi-capable common-rail bench; OM651 injectors are solenoid Delphi units.
What is Delphi 28342997?+
A Delphi solenoid common-rail injector for the Mercedes-Benz OM651 2.1 CDI engine. The Mercedes OE number is A6510704987.
Which Mercedes models use 28342997?+
OM651-engined A/B/C/E-Class, CLA, GLA, GLK/GLC, Vito, V-Class and Sprinter, plus Jeep Compass/Patriot and Infiniti Q50 using the OM651.
What is the Mercedes OE number for 28342997?+
A6510704987, with related supersessions such as A6510700587, A6510702887 and A6510703087.
Is 28342997 the same as 28348371?+
28348371 is an equivalent Delphi OM651 number; confirm exact calibration by VIN as OM651 has several injector variants.
Is this injector solenoid or piezo?+
It is a solenoid common-rail injector.
Do I need to code it after fitting?+
Yes - OM651 injectors require quantity/coding adaptation with Mercedes diagnostics after replacement.
What are the symptoms of a bad OM651 injector?+
Hard starting, misfire/rough idle, power loss, black smoke, higher fuel consumption and injector fault codes.
Can I test it on a Bosch bench?+
No - use a Delphi-capable common-rail bench for correct testing.
Should I change one or all four?+
Diagnose each with live correction values and a bench test; on high-mileage engines failures often cluster, so check all four.
Why does the OM651 misfire when cold?+
A weak/leaking injector is worst when cold because back-leakage and poor atomisation have the biggest effect at low temperature.
Why renew the copper washer?+
It is a one-use crush seal; reusing it risks combustion blow-by and carbon build-up that can seize the injector.
Does a remanufactured 28342997 perform like new?+
A properly remanufactured unit is bench-tested and recalibrated to the Delphi plan to meet original delivery and back-leakage specs.