Home DIY Diesel Particle Filter Cleaning

Everyday we have customers who come in and are looking for a quick fix for DPF problems. Whether your DPF light has come on the dash or your Diesel car is lacking in power a DPF problem is a common occurrence in modern Diesel engines. I will first start at the basics to fully understand what a Diesel Particle Filter is used for.

What is a DPF or Diesel Particle Filter:

A Diesel Particulate Filter (DPF) is a device designed to remove diesel particulate matter or soot from the exhaust gas of a diesel engine. Here’s a more detailed explanation:

1. Purpose and Function: The main purpose of the DPF is to filter and store exhaust soot, which is a byproduct of diesel combustion. This is important to reduce emissions of particulate matter, which are harmful to human health and the environment.
2. Location and Design: The DPF is typically located in the exhaust system, downstream of the engine and often after or integrated with the catalytic converter. It consists of a ceramic structure or a metallic filter media that traps particulate matter as the exhaust gas flows through it.
3. Regeneration Process: Over time, the DPF becomes filled with trapped soot, which can block exhaust flow and reduce engine performance. To prevent this, the DPF is designed to periodically “regenerate,” or burn off the accumulated soot. There are two primary methods of regeneration:
   • Passive Regeneration: This occurs naturally when the vehicle’s operating conditions (like high-speed driving) raise the exhaust temperature to a level where the soot can burn off.
   • Active Regeneration: When passive regeneration is insufficient, the vehicle’s engine management system initiates active regeneration. It involves injecting extra fuel into the exhaust stream, increasing the temperature in the DPF, and burning off the soot.
4. Maintenance and Issues: Regular maintenance of the DPF is crucial. A blocked or malfunctioning DPF can cause reduced engine performance, increased fuel consumption, and higher emissions. In some cases, a DPF may need to be manually cleaned or replaced if it becomes too clogged.
5. Legislation and Environmental Impact: The introduction of DPFs in diesel vehicles has been driven largely by stricter emission standards aimed at reducing air pollution. DPFs are effective in capturing and reducing the amount of particulate matter released by diesel engines, thus contributing to cleaner air.

In summary, the Diesel Particulate Filter is a key component in modern diesel vehicles, playing a critical role in reducing harmful emissions and helping to meet environmental regulations.

What causes a DPF to get blocked:

A Diesel Particulate Filter (DPF) can get blocked due to several reasons, often related to driving habits, maintenance, or engine performance. Here are some common causes:

1. Short Journeys at Low Speeds: Frequent short trips where the engine doesn’t reach its optimal operating temperature can prevent the DPF from reaching the temperature required for passive regeneration. This is particularly common in city driving where the engine is not running long enough or at high enough speeds to initiate the natural burn-off of particulate matter.
2. Incorrect Engine Oil: Using engine oil that is not suitable for diesel engines with a DPF can lead to excessive ash buildup. Certain additives in unsuitable oils can create more soot, which can clog the filter.
3. Poor Fuel Quality: Low-quality diesel fuel can lead to incomplete combustion, resulting in more particulates that can block the DPF.
4. Faulty Engine Management System: Problems with the engine’s management system, such as faulty sensors or injectors, can lead to an incorrect air-to-fuel ratio, causing incomplete combustion and excess soot production.
5. Infrequent Servicing: Not adhering to the recommended service intervals can lead to a buildup of soot in the DPF. Regular maintenance is crucial for the health of the DPF and the overall engine performance.
6. Turbocharger or EGR Valve Issues: Problems with the Exhaust Gas Recirculation (EGR) valve or the turbocharger can affect the engine’s combustion efficiency, leading to higher soot production.
7. Stop-Start Driving Conditions: Driving in heavy traffic with frequent stopping and starting can prevent the DPF from reaching the temperatures needed for regeneration.
8. Failed Regenerations: If the engine does not complete its regeneration cycle (which can be interrupted by stopping the engine), the DPF can become overloaded with soot. Over time, repeated failed regeneration attempts can lead to a fully blocked filter.

It’s important for drivers of diesel vehicles to be aware of these factors and to try to drive in a way that supports the health of the DPF, such as occasionally driving at higher speeds for extended periods to facilitate passive regeneration. Regular maintenance and using the correct consumables (like engine oil and fuel) are also crucial in preventing DPF blockages.

DIY solutions to a blocked DPF:

We have three products that really work when trying to unblock a DPF from home. First you will need to decide how you would like to tackle this job. Your technical knowledge, tools available and accessibility to the DPF should all be considered before choosing a product that’s right for you. Option one is the simplest, the JLM DPF Cleaner additive, Option Two is the more technical JLM DPF Spray and Option Three is the most technical Off Car DPF Cleaner but probably the most effective solution.

Option one: JLM J02210 DPF Cleaner Diesel Additive

The JLM J02210 Diesel Particulate Filter (DPF) Cleaner is a product designed to clean and regenerate the DPF in diesel engines. Here’s a guide on how to use it:

1. Suitable for All Diesel Engines: The JLM J02210 is compatible with all diesel engines.
2. Quantity and Mixing: You need to add 375 ml of JLM J02210 to your diesel fuel tank. This should be done either before or after filling the tank with 60 liters of diesel fuel.
3. Usage Process: After adding the cleaner to the fuel tank, ensure that you close the fuel cap properly. Then, simply drive your vehicle. The product works as you drive, so there’s no need for additional steps or processes.
4. Effectiveness: The JLM J02210 helps in dissolving the soot in the DPF and allows it to be burned off during normal driving, thus keeping the DPF clean and functioning efficiently. It not only cleans the DPF but also helps in improving fuel economy and reducing emissions.
5. Safety Precautions: Always handle the product with care. It’s advisable to wear gloves and eye protection when using it. Ensure the engine is not hot when applying the product, and avoid direct sunlight exposure. Keep it out of reach of children and pets.
6. Regular Use for Best Results: For optimal results and to maintain the health of your DPF, it’s recommended to use the product regularly.

Remember, maintaining your DPF is crucial for the efficient operation of your diesel engine and for minimizing emissions. If you notice any issues with your DPF, such as warning lights on your dashboard or a decrease in engine performance, using a product like JLM J02210 can be an effective way to address these problems​

Option Two: JLM J02220 DPF Cleaner Aerosol

Using the JLM Diesel DPF Spray J02220 is a process intended for cleaning the Diesel Particulate Filter (DPF) in diesel vehicles. Here’s a step-by-step guide on how to use it effectively:

1. Engine Preparation: Before using the DPF Spray, bring the engine to its operating temperature. This usually involves running the vehicle until it reaches its normal operational state.
2. Sensor Removal: The next step is to remove the temperature sensor and/or the pressure sensor from the exhaust system. This is typically done to provide access to the DPF and to allow the spray to be applied directly.
3. Applying the Spray: With the sensors removed, insert the spray pipe (which comes with a special nozzle) into the opening that now leads to the DPF. Spray the entire contents of the can into the DPF. This process involves a careful application to ensure that the cleaner is distributed evenly within the filter.
4. Reassemble Sensors: After the application of the spray, re-install the temperature sensor and/or the pressure sensor.
5. Additional Cleaning Step (Optional): For enhanced results, it’s recommended to add a DPF cleaner liquid (like JLM J02210 DPF Cleaner) to the fuel tank. This step is usually done after spraying and before the regeneration process.
6. Regenerate the DPF: This can be achieved through a diagnostics test or by taking the vehicle on a test drive. The purpose is to allow the vehicle to reach conditions where the DPF can undergo a regeneration process, helping to clean it thoroughly.
7. Final Check: After the regeneration process, check the engine management system for any error codes. If present, these should be cleared.
8. Safety Precautions: Always take the correct protective measures when using chemical products. Wearing gloves and safety goggles is recommended throughout the entire cleaning process.
9. Disposal: Properly dispose of the can following your local regulations for disposing of aerosol products.

Remember, this guide provides a general overview of the process. It’s crucial to follow the specific instructions provided with the JLM Diesel DPF Spray J02220 for safe and effective use. Additionally, if you are not familiar with automotive repair or maintenance, it’s advisable to seek assistance from a professional mechanic

Option 3: Wynns Off Car DPF Cleaner 5 Litre

To use Wynn’s Off-Car DPF Cleaner, follow these steps:

1. Remove the DPF: Take the diesel particulate filter out of the vehicle and remove any sensors attached to it.
2. Seal Openings: Seal the end of the filter and any openings where the sensors were removed.
3. Fill with Cleaner: Pour the Wynn’s Off-Car DPF Cleaner into the filter, ensuring the surface of the filter is fully covered.
4. Soak Time: Allow the filter to soak in the cleaner for 90-120 minutes. For extremely contaminated filters, you can soak for up to 8 hours.
5. Agitate the Filter: Occasionally, gently agitate the filter during the soaking period to aid the cleaning process.
6. Drain the Cleaner: After soaking, empty the cleaner from the filter.
7. Rinse with Water: Rinse the filter from both sides using warm water. Continue rinsing until the water runs clear through all openings.
8. Dry the Filter: Gently dry the filter using low-pressure air.
9. Refit the Filter: Once the filter is dry, refit it into the vehicle.

This process is designed for heavily blocked DPFs and requires the filter to be removed from the vehicle for thorough cleaning.

Conclusion

These are three great solutions to cleaning your DPF at home depending on your confidence and tools available to you. If you are hesitant to use any of these methods, always consult with your mechanic or consider using a mechanic that specialises in DPF cleaning using high powered cleaning machines that are solely used to clean DPFs. also as a side note, Drying a DPF after cleaning is an essential step that you should not overlook.