12638824
DELPHI 12638824 High Pressure Fuel Injector Chevrolet Silverado Tahoe Suburban GMC Sierra Yukon 5.3L 6.2L V8 EcoTec3 FJ1217
12698484, 12661031, 217-3445, FJ1217, 12672368--150 barTechnical Specifications
| Specification | Value |
|---|---|
| Operating PressureCore Spec | |
| Injector Technology | High-Pressure Direct Cylinder Electromagnetic Solenoid |
| Coil Resistance | 1.3 - 1.7 Ohms (Low Impedance Peak-and-Hold) |
| Seal Design | Virgin Teflon Combustion Chamber Radial Seal |
| Fuel Rail Fastener Torque | 12 N·m |
| Jumper Line Torque | 30 N·m |
| Flow Rate | 126 g/min @ 100 bar test fluid |
| OE Cross References | 12638824, 12668390, 12698484, 12661031, 217-3445, FJ1217 |
| Failure Symptoms | Rough cold idle, misfires (P0300-P0308), rich codes (P0172/P0175), fuel wash, catalytic converter damage |
| Diagnostic Test | Automated injector balance pressure drop test via GDS2 scan tool |
Matched High-Pressure Fuel Pump (Fuel Circuit Assembly)
Operates on the same high-pressure rail circuit. When troubleshooting low rail pressure (DTC P0087), verify pump volumetric delivery before replacing injectors.
Installation Tips
- [
- "Depressurize fuel system and disconnect battery; remove intake manifold and fuel rail heat shields.",
- "Remove high-pressure cross-over fuel pipe and discard single-use high pressure metal line seals.",
- "Remove fuel rail retaining bolts and use special slide hammer puller tool (EN-47218) to lift rail assembly.",
- "Carefully unclip suspect injectors from the fuel rail; inspect injector bores in the cylinder head.",
- "Install brand new Teflon combustion seals using seal sizing tool (EN-48266) to ensure compression recovery.",
- "Apply clean engine oil sparingly to top O-rings; insert injectors firmly into rail retaining clips.",
- "Seat fuel rail into cylinder heads squarely and torque mounting bolts in two passes: 5 N·m then final 12 N·m.",
- "Install new intermediate crossover pipe and torque flare fittings to 30 N·m; clear all misfire codes."
- ]
Diagnostic Trouble Codes & Fault Protocols
Common diagnostic trouble codes (DTCs) triggered when this common rail injector experiences wear, circuit faults, or calibration drift:
Fuel Rail / System Pressure Too Low
Excessive internal backleak from worn control valve seats drops common rail pressure below target under engine load.
Injector Circuit Malfunction / Open Circuit
Solenoid coil resistance drift (0.2-0.5 Ω) or piezo stack degradation triggers driver stage shutdown on affected cylinders.
Cylinder Misfire & Balancing Deviation
Carbon-clogged nozzle spray holes or missing IMA calibration causes uneven cylinder contribution. Recode ECM and verify washer seating.
Fuel Rail / System Pressure Too High
Spill line backpressure or stuck metering valve prevents rail depressurization, creating overpressure risks under load.
Technical Diagnostic & Service Protocols
Authoritative field procedures, diagnostic testing thresholds, and service SOPs for this assembly.