12638824
DELPHI 12638824 Inyector Directo Silverado Sierra Tahoe 5.3L V8
12698484, 12661031, 217-3445, FJ1217, 12672368--150 barEspecificaciones técnicas
| Especificación | Valor |
|---|---|
| Presión de servicioDato clave | |
| 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 |
Bomba de alta presión compatible (Ensamblaje del circuito de combustible)
Funciona en el mismo circuito de alta presión Common Rail. Al diagnosticar baja presión (P0087), verifique el caudal de la bomba antes de sustituir los inyectores.
Consejos de instalación
- [
- "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."
- ]
Codigos de Falla (DTC) y Protocolos de Diagnostico
Codigos de falla de diagnostico (DTC) comunes que se activan cuando este inyector common rail experimenta desgaste, fallas de circuito o desbalance:
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.
Protocolos Técnicos de Diagnóstico y Servicio
Procedimientos de taller verificados, umbrales de prueba y pautas de servicio para este conjunto.