Ameer Randolph
Honda fuel injectors come in two types: peak and hold (low impedance) and saturated (high impedance). The difference between the two is that peak and hold injectors exhibit less electrical resistance than saturated injector coils. Typically, peak and hold Honda injectors have a resistance of 2 to 3 ohms, while saturated injectors measure around 12 ohms. This information is essential when considering engine modifications, such as an engine transplant or swapping stock fuel injectors. In this case, let's explore the specifics of Honda OBD2 fuel injectors and their ohms.
| Characteristics | Values |
|---|---|
| Type of Fuel Injectors | Peak and hold (low impedance) and saturated (high impedance) |
| Coil Resistance (Peak and hold) | 2-3 ohms |
| Coil Resistance (Saturated) | 12 ohms |
| Coil Resistance (OBD2) | 12.5 ohms |
Explore related products
What You'll Learn
Low impedance injectors have 2.5-3 ohms of resistance
Honda fuel injectors come in two types: peak and hold (low impedance) and saturated (high impedance). Low impedance injectors have a resistance of 2.5-3 ohms, while high impedance injectors have a resistance of around 12 ohms. This difference in resistance is due to the coil, with low impedance injector coils exhibiting less electrical resistance than high impedance coils.
Low impedance injectors send a more powerful electrical signal, typically around 56 amps, to open. Once the injector is open, the signal drops to 23 amps. This design allows for quicker opening and closing but also causes the injector to run hotter. Low impedance injectors are used in purpose-built applications and are ideal for high fuel demands.
To determine the type of fuel injectors your Honda has, you can use a digital volt-ohm meter (DVOM) or even an analog one. Simply set the tool to read ohms and connect the probes to the injector's two pins.
If you find that your low impedance injectors are not compatible with your ECU, you can add an injector resistor box. This is a simple fix that can be sourced from older Hondas or Mitsubishis. The resistor box steps down the current between the ECU and the fuel injectors, ensuring they work together without damaging the ECU.
In summary, low impedance Honda fuel injectors have a resistance of 2.5-3 ohms, and this lower resistance allows for a more powerful electrical signal, resulting in quicker opening and closing of the injectors. However, it's important to ensure compatibility with your ECU to avoid any issues.
Cleaning Foreman 500 Fuel Injectors: DIY Guide
You may want to see also
Explore related products
High impedance injectors have 12 ohms of resistance
Honda fuel injectors come in two types: peak and hold (low impedance) and saturated (high impedance). The difference between the two is that peak and hold injectors exhibit less electrical resistance than saturated injectors. Typically, peak and hold Honda injectors will have a resistance of 2 to 3 ohms, while saturated injectors will measure around 12 ohms.
Low impedance injectors, on the other hand, have a coil resistance of 4 ohms or lower. They are designed for high-performance applications where a large amount of fuel is required. They are also more expensive and complex than high impedance injectors.
It's important to ensure you are using the correct type of injector for your vehicle, as using low impedance injectors with an ECU that is meant for high impedance injectors can cause the injector drivers to heat up and fail due to the added current. To avoid this, you can add an injector resistor box, which can be sourced from older Hondas or Mitsubishis.
You can determine the impedance of your fuel injectors by using a digital volt-ohm meter (DVOM) or an analog one. Simply set the tool to read ohms and connect the probes to the injector's two pins.
There are also some OBD2 Honda fuel injectors available on the market that have a coil resistance of 12.5 ohms and are designed to fit various Honda models.
Cleaning Your C4 Corvette's Fuel Injector: A Step-by-Step Guide
You may want to see also
Explore related products
Honda transitioned from low to high impedance in the mid-90s
Honda fuel injectors come in two types: peak and hold (low impedance) and saturated (high impedance). Peak and hold injectors typically exhibit resistance between 2 and 6 ohms, while saturated injectors measure around 10 to 12 ohms.
In the mid-90s, Honda transitioned from low to high impedance fuel injectors. This change addressed the issue of low impedance injectors heating up and failing due to the increased current flow. The high impedance injectors, also known as saturated injectors, have higher resistance, typically around 12 ohms, which helps mitigate the heat issue.
The transition to high impedance injectors was likely a response to the challenges of using low impedance injectors without a resistor box. Low impedance injectors, with their lower resistance, can cause the injector drivers to heat up and fail. The increased current flow associated with low impedance injectors can lead to a substantial temperature increase, resulting in potential damage to the driver transistor.
To address this issue, Honda adopted high impedance injectors, which have higher resistance and, consequently, lower current flow. This design reduces the likelihood of overheating and improves the reliability of the fuel injection system.
It is worth noting that the specific ohm rating of fuel injectors can vary depending on the vehicle model and year. For example, the 1986-1991 Acura Integra and the 1988-1997 Honda Accord, both listed as compatible with the OBD1 and OBD2 fuel injectors in question, require the removal of the OEM resistor box. This suggests that these vehicles originally had low impedance injectors and transitioned to high impedance injectors as part of Honda's broader shift in the mid-90s.
STP Fuel Injector Cleaner: An Effective Solution?
You may want to see also
Explore related products
Low impedance injectors can be incompatible with certain ECUs
Honda fuel injectors come in two types: peak and hold (low impedance) and saturated (high impedance). Peak and hold injectors exhibit less electrical resistance, with a resistance of 2 to 3 ohms, while saturated injectors have a higher resistance of around 12 ohms. This distinction is important when considering compatibility with an ECU.
Low impedance injectors are not compatible with all ECUs. Some Honda ECUs are not designed to work with low impedance injectors. Using low impedance injectors with an incompatible ECU can cause the injector drivers to heat up and fail due to the increased current. This is because resistance decreases current, and current creates heat. Therefore, the higher current associated with low impedance injectors can lead to overheating and potential failure of the ECU and the injectors themselves.
The incompatibility between certain ECUs and low impedance injectors can be addressed by adding an injector resistor box. The resistor box is a simple device that steps down the current between the ECU and the fuel injectors, preventing overheating. It can be sourced from older Hondas or Mitsubishis and is relatively easy to wire up.
It is important to determine the type of fuel injectors your vehicle uses and to select injectors that match the impedance requirements of your ECU. Failing to do so can damage the ECU. While some aftermarket ECUs can support both low and high impedance injectors, it is crucial to verify their system support and select parts with proper documentation.
Bleeding Air from Fuel Injectors on a 4700 International: Step-by-Step Guide
You may want to see also
Explore related products
$22.99 $25.99
Fuel injector resistance can be measured with a DVOM
Fuel injectors play a crucial role in ensuring the right amount of fuel enters a car's cylinders. Faulty fuel injectors can lead to poor fuel economy and engine performance. To ensure that fuel injectors are functioning optimally, it is essential to periodically check their resistance using a digital volt-ohm meter (DVOM).
Types of Fuel Injectors
There are two main types of fuel injectors: peak and hold (low impedance) and saturated (high impedance). Peak and hold injectors exhibit lower electrical resistance, typically between 2 and 5 ohms, while saturated injectors have higher resistance, usually around 12 ohms. Honda fuel injectors, for example, typically fall into these two categories.
Measuring Fuel Injector Resistance with a DVOM
To measure fuel injector resistance with a DVOM, follow these steps:
- Set the DVOM to Measure Ohms: Ensure the DVOM is set to measure ohms. If the meter does not autorange, set it to the lowest range.
- Connect the DVOM to the Fuel Injector: Connect the DVOM's probes to the injector's pins. The injector does not need to be installed for this test.
- Test the Resistance: With the DVOM connected, you can now test the resistance of the fuel injector. A typical high impedance injector will measure between 12 and 17 ohms, while a low impedance injector will measure between 2 and 5 ohms.
- Repeat for All Injectors: It is important to test all injectors and ensure they have a resistance within half an ohm of each other. Any significant deviation indicates that the injector should be inspected to ensure proper functioning.
- Cross-Reference with Specifications: You can find the correct resistance for your specific injectors by searching online or referring to your vehicle's repair guide.
By following these steps, you can ensure that your fuel injectors are within the expected resistance range, helping to maintain optimal fuel delivery and engine performance.
Cleaning Your Duramax: Fuel Injector Maintenance Guide
You may want to see also
Frequently asked questions
OBD2 Honda fuel injectors have a coil resistance of 12.5 ohms.
Low impedance injectors have a resistance of around 2.5-3 ohms, while high impedance injectors have a resistance of around 12 ohms.
You can use a digital volt-ohm meter (DVOM) to measure the resistance of your Honda fuel injectors. Set the tool to read ohms and connect the probes to the injector's two pins.
