Denso DCRI300890 Diesel Injector

On the 2.5L DI-D 16V platform, a failing DENSO DCRI300890 injector typically presents as: hard starting or no-start; rough, shaky idle; misfire or one cylinder cutting out; black smoke and diesel-smelling exhaust; loss of power, higher fuel consumption, warning light.

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: nozzle wear / clogging from contaminated fuel degrading atomisation — the documented main cause on this common-rail 4d56; injector internal leakage dragging rail pressure down; unregistered injector id codes after replacement causing rough idle and noise.

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

Denso injectors carry an ID code — register the new code after fitting or the engine will idle rough. Use a cylinder-balance test: minimal rpm change on one cylinder identifies the weak injector. Check for external diesel leaks around the injector bases and lines. Rule out SCV / rail-pressure control faults (P0088/P0089) before condemning injectors.

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 DCRI300890 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 DCRI300890 trusted family covers 3 verified vehicle fitments across 1 make: Mitsubishi. Every fitment listed on this page is registry-verified — no scraped or assumed applications.

DCRI300890 supersedes or cross-references 7 further OE numbers, including HRD731, HRD738, 1465A367, 295050-0890, 2950500890, 295050-089X and 295050089X. 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.