Sylvie Willis
The Duramax is an example of a direct injection diesel engine, which means that the injector is located directly in the combustion chamber of the cylinder. However, some sources also refer to the Duramax as having an indirect injection system, where the injector is located in a separate, small pre-combustion chamber connected to the main cylinder. This type of indirect fuel injector, also known as the 9th injector, is designed to match the fit and function of the original part on specified vehicles, and is engineered for reliable performance and durability.
| Characteristics | Values |
|---|---|
| Full name | Chevrolet Duramax Indirect Fuel Injector |
| Years | 2011-2016 |
| Engine size | 6.6L |
| Engine type | Diesel |
| Type of injector | Indirect |
| Location | Mounted in the exhaust |
| Function | Transfers diesel fuel from the low-pressure side of the fuel pump to the high-pressure side |
| Common issues | Malfunction indicator light (MIL), leaking, failure to seal shut |
| Price | $199.95 |
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What You'll Learn
Duramax indirect fuel injectors are hydrocarbon injectors (HCIs)
The Duramax indirect fuel injector is located on the rear of the right cylinder head, with a line that connects to the exhaust down tube. The injector mounts in the exhaust and introduces fuel during regeneration to increase the temperature, aiding in the regeneration process. The injectors transfer diesel fuel from the low-pressure side of the fuel pump to the high-pressure side, and spray diesel fuel directly into the exhaust system. The fuel then ignites in the exhaust and produces the heat required for the exhaust after the treatment regeneration process.
A common issue with Duramax indirect fuel injectors is that they can become stuck in the closed position or produce low flow, which can trigger a malfunction indicator light (MIL). Another issue is that the injector may leak, allowing fuel to enter the exhaust when not required, which can lead to emission faults.
The Duramax indirect fuel injector is often referred to as a ""direct injection engine," which can be confusing as all diesel engines are technically direct injection. However, the Duramax has a separate little "pre-combustion" chamber that is connected to the main cylinder by a short passage, which makes it an indirect injection engine.
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They are also called aftertreatment dosers
The Duramax indirect fuel injector, also known as the "9th injector", is a hydrocarbon injector (HCI) or aftertreatment doser. It is located on the rear of the right cylinder head and is connected to the exhaust down tube. This injector introduces fuel during regeneration to increase the temperature, aiding in the regeneration process.
The injector transfers diesel fuel from the low-pressure side of the fuel pump to the high-pressure side, spraying diesel fuel directly into the exhaust system. The fuel then ignites in the exhaust, producing the heat required for the exhaust after-treatment regeneration process. This process is necessary for certain vehicles, as without it, issues such as malfunction indicator lights (MIL) and emission faults can occur.
The aftertreatment doser is designed to match the fit and function of the original part in specified vehicles, providing reliable performance and durability. It is made from quality materials and is a direct replacement for the original part, which may have failed due to wear, corrosion, or fouling.
Aftertreatment dosers can be unreliable due to frost, which can cause clogging and crystallization. However, advancements in technology have led to the development of freeze-robust systems, such as the UL2 urea dosing system, which offers improved reliability and quicker dosing readiness. This system also prevents system damage during interruptions of power to the vehicle and provides quicker NOx treatment.
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They are designed to match the original part on specified vehicles
The Duramax indirect fuel injector is a hydrocarbon injector (HCI), also known as an aftertreatment doser. It is designed to match the fit and function of the original part on specified vehicles, ensuring reliable performance and durability. This injector is engineered to be a direct replacement for the original factory part, addressing issues such as wear, corrosion, or fouling.
The Duramax injector is typically found in Chevrolet and GMC vehicles with diesel engines, specifically those with the 6.6L LML engine produced between 2011 and 2016. It is a premium replacement part manufactured using high-precision equipment and the latest enhancements, making it a reliable and durable choice for vehicle owners.
Indirect fuel injectors are located on the rear of the right cylinder head and are connected to the exhaust down tube. They play a crucial role in transferring diesel fuel from the low-pressure side of the fuel pump to the high-pressure side, spraying diesel fuel directly into the exhaust system. This process helps ignite the fuel in the exhaust, producing the necessary heat for the exhaust after-treatment regeneration process.
The Duramax indirect fuel injector is designed to match the specifications of the original equipment (OE) part. This means that it is created to fit seamlessly into the designated vehicle models, maintaining the same performance, quality, and functionality as the original injector. By matching the original part, the replacement injector ensures that the vehicle's engine can operate optimally, just as it did when it was first manufactured.
It is important to note that the Duramax indirect fuel injector is engineered for specific vehicle models and years. The injector's design and functionality are tailored to the unique characteristics of the specified vehicles, ensuring optimal performance and compatibility. This attention to detail in the design and manufacturing process reinforces the injector's reliability and longevity, providing a dependable solution for vehicle owners.
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They are mounted in the exhaust
The Duramax indirect fuel injector is mounted in the exhaust. This injector introduces fuel during regeneration to increase the temperature, aiding in the regeneration process. This process involves spraying diesel fuel directly into the exhaust system, which then ignites to produce the heat required for the exhaust after-treatment regeneration process.
The injector is located on the rear of the right cylinder head, with a line that connects to the exhaust down tube. It transfers diesel fuel from the low-pressure side of the fuel pump to the high-pressure side.
The Duramax indirect fuel injector is also known as the "9th" injector or a hydrocarbon injector (HCI). It is a direct replacement for the original part, designed to match the fit and function of the factory part on specified vehicles.
The injector is known to sometimes fail, with common issues including leaking and becoming stuck in the closed position, which can lead to emission faults. However, it is possible to perform a DIY replacement of the injector, with some people opting to do so under an extended warranty.
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They can become stuck or produce low flow
The indirect fuel injector in a Duramax engine can become stuck in the closed position or produce low flow. This issue is known to occur in several GM vans and pickups with 6.6L engines. When this happens, the malfunction indicator light (MIL) may turn on.
There are several ways to diagnose and address this issue. One way is to use a scan tool to command the rail pressure to 21,000 PSI with the engine at operating temperature. If the rail pressure does not reach 21,000 PSI at idle, it is likely that the injectors are faulty. Another test involves cranking the engine for 15 seconds and checking for a steady flow of fuel from the fitting on the rail. If there is no steady flow, the high-pressure pump may need to be checked or replaced.
It is important to note that low rail pressure can also be caused by a faulty high-pressure pump, especially if the pressure reaches 21,000 PSI at idle but drops under a heavy load. In this case, the high-pressure regulator should be removed from the pump and checked for metal debris. If metal is found, the entire high-pressure fuel system must be inspected and replaced as needed. This includes the injection pump, rails, fuel lines, fuel injectors, and related components.
To prevent and address this issue, indirect diesel fuel injectors are available as replacement parts. These injectors are designed to match the original equipment (OE) specifications and are manufactured using high-precision equipment and the latest enhancements to ensure reliable performance and durability.
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Frequently asked questions
A Duramax indirect fuel injector is a hydrocarbon injector (HCI) that is also called an aftertreatment doser.
It mounts in the exhaust and introduces fuel during regeneration to increase the temperature, aiding in the regeneration process.
Duramax indirect fuel injectors are used in the 2011-2016 Chevrolet Duramax 6.6L LML.
A common failure for the Duramax indirect fuel injector is leaking, which can lead to emission faults. Other issues include trouble codes such as P0420, P246F, and P242B. Some users have also noted that the design is flawed, leading to frequent failures.
