12638824
DELPHI 12638824 بخاخ وقود مباشر سيلفرادو سييرا تاهو 5.3L 6.2L V8
12698484, 12661031, 217-3445, FJ1217, 12672368--150 barالمواصفات الفنية
| المواصفة | القيمة |
|---|---|
| ضغط التشغيلمواصفة أساسية | |
| 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 |
مضخة وقود الضغط العالي المتوافقة (مجموعة دائرة الوقود)
تعمل على نفس دائرة الضغط العالي بنظام القضيب المشترك. عند تشخيص انخفاض الضغط (P0087)، تحقق من تدفق المضخة قبل استبدال الحاقنات.
إرشادات التركيب
- [
- "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."
- ]
رموز الاعطال التشخيصية (DTC) وبروتوكولات الفحص
رموز اعطال التشخيص الشائعة (DTC) التي يتم تسجيلها عند تآكل حاقن الديزل أو حدوث خلل كهربائي:
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.
بروتوكولات التشخيص والخدمة الفنية
إجراءات ورشة العمل المعتمدة، وحدود الاختبار التشخيصية، ومعايير الخدمة لهذا المكون.