How To Install Egr Delete Kit Lml Duramax?

The LML Duramax engines come equipped with an EGR (Exhaust Gas Recirculation) system. Although this system is designed to reduce emissions, it can also cause various issues such as decreased fuel efficiency and engine performance. To address these concerns, many Duramax owners choose to install an EGR delete kit. In this article, we will guide you through the installation process, covering everything from preparation to post-installation considerations.

Preparing for the Installation

Before starting the installation process, it is essential to gather the necessary tools and materials. Some of the commonly needed items include a socket set, wrenches, screwdrivers, gaskets, and the EGR delete kit itself. Additionally, ensure that you have a safe and spacious working area, with proper lighting and ventilation.

To ensure safety throughout the installation process, it is vital to take adequate precautions. Make sure the engine is cool before beginning. It is also recommended to wear protective gloves and goggles to prevent any injuries. Keeping a fire extinguisher nearby is another precautionary measure to consider.

Before starting any work on the EGR system, disconnect the vehicle’s battery. This step will minimize the risk of electrical shock and prevent any accidental activation of the system.

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Removing the EGR System Components

In this phase of the installation, we will focus on removing the different components of the EGR system.

Start by removing the EGR cooler, which is typically located near the exhaust manifold. This component is responsible for cooling the recirculated exhaust gases. Use the appropriate tools to disconnect the coolant lines and bolts securing the EGR cooler. Carefully detach the cooler from the engine, ensuring not to damage any surrounding components.

Next, locate and remove the EGR valve, which controls the flow of exhaust gases into the intake manifold. Follow the manufacturer’s instructions to disconnect the wiring harness and vacuum lines. Once disconnected, remove the bolts securing the EGR valve, and carefully take it out of the engine.

After removing the EGR cooler and valve, move on to deleting the EGR coolant lines. These lines circulate coolant to the EGR system for cooling purposes. Disconnect the lines carefully, ensuring that coolant does not spill and create a mess during the removal process.

In addition to removing physical components, it is necessary to disable the EGR sensors. Locate these sensors, typically found near the EGR cooler or valve, and disconnect their wiring harnesses. By disabling the sensors, you are ensuring that the engine does not receive false signals from the EGR system after the installation.

Installing the EGR Delete Kit

Once the EGR system components are removed, it is time to proceed with the installation of the EGR delete kit.

Start by mounting the EGR delete pipe or block-off plate, depending on the specific kit you have. The delete pipe or block-off plate replaces the EGR valve, blocking the flow of exhaust gases. Use the provided hardware and gaskets to secure the delete pipe or plate in place, following the manufacturer’s instructions.

Now, install the remaining components of the EGR delete kit. This may include additional coolant lines or adapters, as well as any necessary seals. Make sure to follow the specific instructions provided with your kit to ensure proper installation.

After installing the kit, reconnect the coolant lines that were previously disconnected during the removal process. Ensure that all connections are secure and leak-free. Tighten any bolts or clamps as necessary.

To secure the EGR delete kit in place, use the provided mounting hardware. This will prevent any movement or vibrations that could potentially cause issues in the future. Double-check that all components are properly secured before proceeding.

Testing and Verifying the Installation

With the EGR delete kit installed, it is crucial to test and verify its proper functioning before considering the installation complete.

Reconnect the vehicle’s battery, ensuring all connections are secure. This will provide power to the engine control module (ECM), allowing it to perform a diagnostic scan.

Perform a diagnostic scan using an OBDII scanner or a suitable diagnostic tool. This scan will help identify any remaining issues or potential error codes related to the EGR system. It is essential to address these issues promptly to ensure optimal engine performance.

After the diagnostic scan, inspect the engine and surrounding areas for any signs of leaks or coolant seepage. Make sure all connections are tight and properly sealed. Testing for leaks is crucial to prevent coolant loss and potential engine damage.

To further verify the installation, take the vehicle for a test drive. Monitor the engine’s performance and note any changes after the installation of the EGR delete kit. This will provide valuable feedback on the effectiveness of the modification.

Maintenance and Post-Installation Considerations

To ensure the longevity and optimal performance of the EGR delete kit, regular maintenance is crucial.

Regularly inspect the EGR delete kit for any signs of damage or wear. Check for loose connections and replace any worn-out seals or gaskets. Proper maintenance will help prevent potential issues and prolong the lifespan of the modification.

Monitor engine performance and fuel efficiency after installing the EGR delete kit. Note any improvements or changes in these areas. Keeping track of these factors will help assess the benefits of the modification and identify any potential issues that may arise.

It is important to comply with local emission regulations when installing an EGR delete kit. While the removal of the EGR system may provide performance benefits, it may also result in increased emissions. Ensure that you are aware of the legal implications and potential consequences before proceeding with the installation.


Q1: Is the installation of an EGR delete kit legal?

Ans: Installing an EGR delete kit may not be legal in all areas. Regulations regarding emissions systems vary by jurisdiction, and removing or modifying these systems may result in fines or penalties. Before installing an EGR delete kit, it is crucial to research and understand the specific regulations in your location.

Q2: Will installing an EGR delete kit void my vehicle’s warranty?

Ans: Modifying the EGR system with an EGR delete kit may void the vehicle’s warranty. It is essential to consult the vehicle manufacturer or dealership to understand the warranty implications before proceeding with the installation.

Q3: Can I install an EGR delete kit on my own?

Ans: While it is possible to install an EGR delete kit on your own, it is recommended to have a certain level of mechanical expertise. The installation process involves working with delicate components and adhering to specific instructions. If you are unsure or uncomfortable with the process, it may be wise to seek professional assistance.

Q4: Are there any risks associated with using an EGR delete kit?

Ans: Using an EGR delete kit may have potential risks and consequences. Removing the EGR system can result in increased emissions and potential non-compliance with local regulations. Additionally, it may affect the engine’s overall performance and fuel efficiency. It is important to weigh these factors before deciding to install an EGR delete kit.

Q5: What are the potential impacts on the environment?

Ans: Removing the EGR system through the installation of an EGR delete kit may result in increased emissions, contributing to air pollution. It is important to consider the environmental impact and consult local regulations before proceeding with the modification.


To recap, installing an EGR delete kit on your LML Duramax engine can provide various benefits, including improved engine performance and fuel efficiency. However, it is crucial to undertake the installation process with care and consideration for safety precautions.

Preparing for the installation involves gathering the necessary tools and materials, ensuring safety, and disconnecting the battery. Removing the EGR system components involves taking out the EGR cooler, EGR valve, coolant lines, and disabling the EGR sensors.

Installing the EGR delete kit requires mounting the delete pipe/block-off plate, installing the kit components, and securing the coolant lines. Testing and verifying the installation involves reconnecting the battery, performing a diagnostic scan, checking for leaks, and taking a test drive.

Maintenance and post-installation considerations include regularly inspecting the EGR delete kit, monitoring engine performance and fuel efficiency, and complying with local emission regulations.

It is essential to be aware of the legal implications, warranty considerations, and potential risks associated with using an EGR delete kit. Moreover, it is crucial to consider the environmental impact before proceeding with the modification.

Remember, if you are unsure or uncomfortable with any step of the installation process, it is always wise to seek professional assistance. By following this guide and considering all the factors, you can successfully install an EGR delete kit on your LML Duramax engine, ensuring optimal performance and compliance.

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