12638824
DELPHI 12638824 Injecteur Direct Silverado Sierra Tahoe 5.3L V8
12698484, 12661031, 217-3445, FJ1217, 12672368--150 barSpécifications techniques
| Spécification | Valeur |
|---|---|
| Pression de serviceSpéc. clé | |
| 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 |
Pompe haute pression associée (Ensemble circuit de carburant)
Fonctionne sur le même circuit haute pression Common Rail. En cas de chute de pression (P0087), vérifier le débit de la pompe avant de remplacer les injecteurs.
Conseils de montage
- [
- "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."
- ]
Codes de Defaut (DTC) & Protocoles de Diagnostic
Codes de defaut diagnostiques (DTC) courants déclenchés lorsque cet injecteur common rail subit une usure, des pannes de circuit ou une dérive d'étalonnage:
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.
Protocoles Techniques de Diagnostic & Réparation
Procédures d'atelier vérifiées, seuils de test et guides d'intervention pour cet ensemble.