28342997 — Frequently Asked Questions
Verified answers about the Delphi 28342997 (A6510704987) Mercedes OM651 2.1 CDI Common Rail Injector.
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.