Product Parameters
|
Model |
def doser injector 173-9379 (General series, specific specifications to be selected) |
|
Type |
Saturation-driven low-resistance electromagnetic fuel injector |
|
Applicable Systems |
Low-pressure single-point/multi-point electronic fuel injection systems |
|
Static Flow (@3 bar) |
Commonly available in 150, 200, 250, 320 cc/min, etc. |
|
Coil Resistance |
Low resistance, typical value 2.0 - 4.0 Ω (requires matching with the original vehicle ECU or external resistor) |
|
Operating Pressure |
2.5 - 4.0 bar |
|
Spray Pattern |
Single-hole or multi-hole conical atomization |
|
Interface Type |
Multiple inlet sizes (O-ring seal), multiple electrical plugs available |
|
Compatible Fuels |
Gasoline, Ethanol Gasoline (E10) |
|
Valve Body Material |
Stainless Steel |
|
Operating Voltage |
12V DC system |
FAQ
Q: How do I choose the correct flow rate 173-9379 injector for my car?
A: 1. Find the original manufacturer's information: Consult the original vehicle's repair manual or the part number on the original injector to determine its standard flow rate.
2. Calculate and estimate: If there is no original manufacturer data, you can estimate based on the engine displacement. A very rough estimation formula is: Single-hole injector flow rate (cc/min) ≈ Engine displacement (L) x 0.6 x Number of cylinders. For example, a 2.0L 4-cylinder engine requires approximately 2.0 x 0.6 x 4 = 4.8 L/min, or approximately 120 cc/min per hole. However, it is strongly recommended to use the original manufacturer's data.
Note: If engine modifications have been made (such as turbocharging, high-angle camshafts), the flow rate needs to be increased.
Q: Can a low-resistance injector directly replace the original high-resistance injector?
A: No, it cannot be directly replaced. Low-resistance injectors (2-4Ω) have fewer coil turns and draw more current, requiring a series balancing resistor or peak-hold ECU drive. Otherwise, excessive current can burn out the ECU's internal drive transistor. Original high-resistance injectors (12-16Ω) can be directly driven by the ECU in saturation mode. Before replacement, you must confirm your vehicle's ECU drive method. Universal kits typically include the necessary series resistor.
Q: Does this injector require matching?
A: For older or simple electronic fuel injection systems, after replacing with an injector of the same flow rate, the engine ECU can usually adapt within a certain range through Short-Term Fuel Trim (STFT) and Long-Term Fuel Trim (LTFT), possibly without special matching. However, for optimal performance, it is recommended to: 1. Disconnect the battery negative terminal for a few minutes after replacement to reset the ECU's learning values. 2. Start the engine and let it idle at normal temperature for 10-15 minutes, then perform a low-to-medium speed road test to help the ECU complete its learning. If unstable idling or abnormal fuel consumption occurs after replacement, it may be necessary to check or adjust the air-fuel ratio reference with a diagnostic tool.
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