Here’s a quick guide to figuring out what kind of injectors you have. Or, if you prefer, you can just check out our visual reference page found here. What Kind of injectors do I have
To determine what kind of fuel injector you have, you’ll need to look at several identifying features, such as type, part number, connector style, and specifications. Here’s a step-by-step guide:
🔍 1. Check the Part Number
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Most fuel injectors have a part number stamped or printed on the side.
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Look for numbers/letters like Bosch 028015XXXX, Denso 23250-XXXXX, etc.
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Once you have the part number, search it online to get full specs (flow rate, impedance, spray pattern, etc.).
🔌 2. Look at the Electrical Connector
The style of connector often indicates the manufacturer and injector family:
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EV1 (Jetronic): Older style, square connector
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EV6: Oval or “U”-shaped connector
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EV14: Compact version of EV6, often found on modern injectors
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Delphi/GM Multec: Miniature square or round types
⚙️ 3. Determine the Injector Type
There are a few main types:
| Type | Description |
|---|---|
| Top-feed | Fuel enters from the top; most common |
| Side-feed | Fuel enters from the side (often found in older Nissans/Subarus) |
| Direct Injection (GDI) | Injects fuel directly into combustion chamber, used in modern engines |
🔧 4. Measure or Check Impedance
You can measure resistance (ohms) across the injector terminals using a multimeter:
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High impedance (saturated): ~12–16 ohms
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Low impedance (peak-and-hold): ~2–4 ohms
⚠️ Mixing impedance types with the wrong ECU or driver can damage components.
🌊 5. Identify Flow Rate & Spray Pattern (Optional)
This info is usually found online from the part number or manufacturer spec sheet. Flow rate is typically measured in:
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cc/min (e.g., 440cc)
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lb/hr (e.g., 42 lb/hr)
📸 6. Visual Comparison
Compare your injector to online databases or charts (e.g., Bosch, Injector Dynamics, Fuel Injector Clinic) to find a match based on:
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Size
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O-ring placement
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Tip style (pintle, disc, ball)
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Body shape
🛠️ Optional: Use Tools
Some aftermarket tuners or shops use flow benches or diagnostic tools to test injectors and identify them based on behavior and performance.