Delphi 28307309 Diesel Injector

On the this diesel platform platform, a failing Delphi 28307309 injector typically presents as: hard starting, especially cold; rough idle, uneven running or vibration; misfire and loss of power, limp mode in severe cases; white, black or blue smoke; knocking / ticking from the injector area, fuel smell, higher consumption.

When two or more of these appear together, suspect the injector before peripheral systems — a comparative leak-off test and live-data cylinder-balance review will isolate the failed unit without tear-down.

The documented failure modes on this platform are: early delphi piezo injector failures — widely documented on 2009–2011 om651 engines, addressed by a manufacturer service campaign; injector delivery drift with correction values out of range; injector leakage allowing fuel dilution of the engine oil in advanced cases.

Internal wear cannot be repaired in situ — once delivery drifts outside calibration, remanufacture or replacement is the reliable fix.

Check injector correction values across all four cylinders — an outlier identifies the failing unit. On early (2009–2011) engines with running complaints, injector history matters: many were replaced under the manufacturer campaign — verify which units are fitted. Monitor the engine-oil level on suspected leaking injectors. Injector coding is required after fitting — follow the manufacturer procedure.

Never condemn a common-rail injector on a fault code alone — codes identify the circuit or cylinder, while leak-off volumes and correction values identify the component.

Each remanufactured 28307309 is fully stripped, ultrasonically cleaned and inspected; worn components are replaced with OE-grade parts. The rebuilt unit is then calibrated on a common-rail test bench against the manufacturer's specification sheet — delivery, back-leak and response are all verified before the injector is sealed and despatched with its calibration data on file.

Every unit carries a 12-month parts warranty and free UK delivery.

The 28307309 trusted family covers 6 verified vehicle fitments across 1 make: Mercedes-Benz. Every fitment listed on this page is registry-verified — no scraped or assumed applications.

28307309 supersedes or cross-references 4 further OE numbers, including HRD350, 6510703087, 651070308780 and A6510703087. Always match the reference etched on your failed unit's body — cross-references within a family are verified equivalents, but etched numbers remain the source of truth.