
The 7th injector fuel doser is an additional injector that can be used to feed the common air duct prior to the intake plenum. It is often used in turbocharged or supercharged engines to improve performance and fuel scheduling. The 7th injector fuel doser is designed to be a replacement part for specific car models, such as the Mack and Volvo trucks, and should not be used in other vehicles to avoid damage.
Fuel Doser 7th Injector Characteristics and Values
| Characteristics | Values |
|---|---|
| Brand | Motiv8 |
| Vehicle Compatibility | Volvo Truck D11, D13, D16; Mack Truck MP7, MP8 |
| Vehicle Model Years | 2012-2017 |
| Replacement | Premium grade high-temperature replacement gasket |
| Corrosion | Corrosion-resistant housing materials |
| Fluid Compatibility | Compatible with diesel exhaust fluid |
| Fuel Dosage | Precision-engineered injection spray volume |
| Testing | Vehicle tested to ensure premium quality, performance, and fitment |
| Return Policy | 30-day return policy |
| Installation | Refer to the Mack/Volvo Service Manual |
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What You'll Learn
- The 7th injector is used in Mack and Volvo truck engines
- It is a premium replacement with a high-temperature replacement gasket
- The injector is corrosion-resistant and fluid-compatible
- It is vehicle-tested to ensure premium quality, performance, and fitment
- The 7th injector is also known as a CSI or Cold Start Injector

The 7th injector is used in Mack and Volvo truck engines
- Mack MP7 and MP8 (2012-2017)
- Volvo D11, D13, and D16 (2012-2017)
The 7th injector features a premium grade, high-temperature replacement gasket and new hardware for a professional installation. It is also corrosion-resistant, with housing materials that can withstand harsh environments. The dosage valve materials are compatible with diesel exhaust fluid. Additionally, the fuel dosage is precision-engineered for injection spray volume.
The 7th injector has been vehicle-tested to ensure premium quality, performance, and fitment. It is designed as an exact copy of the original spare parts for the specified car models. The 7th injector is available for purchase online and comes with a 2-year warranty. It is important to note that this product is designed specifically for the above-mentioned applications, and using it on other vehicles may result in damage to this part and related components.
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It is a premium replacement with a high-temperature replacement gasket
The 7th injector fuel doser is a component that is prone to becoming clogged with soot and carbon build-up, especially in trucks that have been running rich, i.e., with too much fuel. This can cause issues with the regen process. If your 7th injector is clogged, you can either get it cleaned at a dealership or repair facility, or you can replace it yourself.
Motiv8 offers a premium replacement fuel doser 7th injector for Mack and Volvo trucks. This replacement injector comes with a high-temperature replacement gasket and new hardware for a professional installation. The gasket is thick and well-made, and the injector also comes with new screws, although some users have reported that these are slightly wider than the screw holes, so it may be necessary to use the old screws instead.
The Motiv8 injector is corrosion-resistant and has been vehicle-tested to ensure premium quality, performance, and fitment. It is compatible with the following truck models:
- Mack 2012-2017 MP7 and MP8
- Volvo 2012-2017 D11, D13, D16
To replace the 7th injector fuel doser, first, remove all body elements according to the vehicle manual to access the doser. Then, gently unscrew the nut (14 mm) fixing the 7th injector tube and disconnect the fuel tube from the injector. Next, gently unscrew the 2 bolts (8 mm) fixing the injector to the pipe and remove the old injector with the gasket. Clean the contacting surface, then install the new injector and gasket in reverse order, tightening the bolts and nut to the specified torque values. Finally, reinstall the removed body elements.
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The injector is corrosion-resistant and fluid-compatible
The 7th injector fuel doser is a fuel injector nozzle used in truck engines, specifically in Mack and Volvo trucks. It is also referred to as an aftertreatment fuel doser injector. If your 7th injector fuel doser becomes clogged with soot and carbon build-up, it will need to be replaced.
The fluid compatibility of the dosage valve materials ensures that the injector can effectively handle and dispense diesel exhaust fluid. This compatibility is crucial to ensure the proper functioning of the injector and the overall performance of the vehicle's engine.
The corrosion resistance and fluid compatibility of the 7th injector fuel doser contribute to its durability and reliability. These features help to extend the lifespan of the injector and ensure its optimal performance over an extended period.
Additionally, the 7th injector fuel doser is designed to provide precise fuel dosage. It features a precision-engineered injection spray volume, ensuring that the correct amount of fuel is dispensed during each injection. This precision helps maintain the engine's efficiency and performance while also reducing the risk of fuel wastage or improper combustion.
It is important to note that the 7th injector fuel doser is designed for specific vehicle models, including the Mack MP7 and MP8, and the Volvo D11, D13, and D16. Installing this injector on other vehicles may result in damage to the injector or related components. Therefore, it is crucial to refer to the vehicle's service manual and ensure compatibility before installation.
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It is vehicle-tested to ensure premium quality, performance, and fitment
The 7th injector fuel doser is a part used in MACK and VOLVO truck engines. The Motiv8 7th Injector Fuel Doser is vehicle-tested to ensure premium quality, performance, and fitment. This is achieved through the use of industry-leading materials and production processes. The part is designed to work and fit just like the original Volvo and Mack trucks' 7th injector fuel doser.
The 7th injector fuel doser is a direct plug-and-play replacement for the original AHI Module and 7th Injector. It is a direct-fit OE replacement, ensuring proper fit, form, and performance for ease of installation. The product is engineered by an advanced team of experts in the United States, ensuring a high level of quality and performance.
The 7th injector fuel doser has been extensively tested on and off the vehicle to ensure proper fit and performance. It is made from premium materials to ensure high performance and reliability. The product comes with a two-year warranty, guaranteeing that every new part is free from defects under normal use for two years or 24,000 miles.
The Motiv8 7th Injector Fuel Doser is a premium replacement part that comes with a premium-grade, high-temperature replacement gasket and new hardware for a professional installation. The product is corrosion-resistant, with housing materials that can withstand harsh environments. The dosage valve materials are compatible with diesel exhaust fluid, and the injection spray volume is precision-engineered.
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The 7th injector is also known as a CSI or Cold Start Injector
In older cars and small engines, such as those in lawnmowers, a choke is used to deliver the extra fuel needed to start engines in colder weather. However, almost all modern cars use the more efficient cold start valve, which is connected to the car's computer system. The cold start valve is run by the thermo time switch, which regulates the time the valve stays open or turns on. It sets a lower fuel control pressure at the fuel distributor, allowing injectors to run richer. As the engine heats up, the electrical signal to the warm-up regulator increases, and the control pressure is raised to lean the fuel system to run with the warmer temperatures.
A faulty cold start injector may cause the vehicle to experience difficulty starting. A decrease in fuel efficiency is another symptom of a bad or failing cold start injector. If the cold start injector leaks at the nozzle, it will cause an excessively rich mixture, resulting in a decrease in fuel efficiency and, in some cases, performance and acceleration. Engine performance issues are another symptom commonly associated with a bad or failing cold start injector. If the cold start injector fails or develops a large enough leak, it can lead to engine stalling or misfires.
If your vehicle is exhibiting any of the above symptoms, it may be time to replace your cold start valve. You can start by checking your owner's manual for the exact part you will need, as cold start injectors can vary widely between car makes and models. The price for a cold start injector car part can vary widely, starting below $40 and going upwards of $200.
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Frequently asked questions
The 7th injector fuel doser is an additional injector that feeds the common air duct prior to the intake plenum. It is used in MACK and VOLVO truck engines.
The 7th injector fuel doser has the following features: premium replacement, corrosion resistance, fluid compatibility, fuel dosage, and on-vehicle testing.
If your 7th injector fuel doser is clogged with soot and carbon build-up, you may need to replace it.
To replace the 7th injector fuel doser, you will need to remove all body elements according to the vehicle manual to access the doser. Then, gently unscrew the nut fixing the 7th injector tube and disconnect the fuel tube. Finally, install the new 7th injector and gasket, and tighten the bolts and nut with the specified torque.








































