Freightliner Dpf Regeneration4/18/2021
However, sometimes these warning lights can be false alarms and you should try clearing the fault using an OBD2 diagnostic tool.View policies. DPF Problems, Symptoms and Fixes By Dan Last Updated: April 24th, 2020 The Diesel Particulate Filter (DPF) is best described as the ticking time bomb in most modern diesels.Similar to EGR problems, the DPF can become clogged up from city driving where the car does not get up to temperature.The whole reason the Diesel Particulate Filter came along was to clean up the diesel car image (Euro 5 Emissions, 2009).
Emissions from diesel cars are a big concern worldwide and thanks to the DPF technology, diesel cars are much cleaner. DPFs are great for the environment and so forth, however they are a right pain when they go wrong. DPF regeneration, repairs and new replacements are seriously expensive and can lead to some vehicles becoming scrapped. Table of Contents How does a DPF Work in Diesel Cars Active DPF Regeneration Passive DPF Regeneration Forced DPF Regeneration What causes DPF failure Symptoms of a Block DPF Filter How to Clear a Blocked DPF and Keep it Clean Remove the DPF from the Exhaust System Have You Bought The Wrong Car How does a DPF Work in Diesel Cars The Diesel Particulate Filter traps the harmful diesel gases that gets cleaned regularly by a process called DPF regeneration. The collected diesel soot particles are burnt off at high temperatures, which results in an ash-like after product. There are 3 different types of DPF regeneration, which are active, passive and forced. Active DPF Regeneration Active reads the back pressure of the exhaust or soot load of the filter to determine when to begin the regeneration. Once initiated, the timing of the fuel injection will alter that will result in the exhaust temperature increasing to burn the soot particles. During an active DPF regeneration, you may notice the following: Higher idle RPMSpeed Cooling fan working harder Poor fuel economy Smells from exhaust Engine note change Passive DPF Regeneration Passive will take place once the exhaust reaches optimum temperatures where the regeneration will automatically begin. The exhaust will reach these temperatures will occur mostly on prolonged highway driving. ![]() Forced DPF Regeneration Forced is where the Active regeneration could not occur that has resulted in the soot levels reaching 70 and above. The diesel car will enter limp mode and will require a car diagnostic tool to force the regeneration. Its important that this is done as soon as possible because once the car reaches 85 soot level, the DPF will need to be removed and cleaned. What causes DPF failure Sadly DPFs do fail and many diesel car owners do not realize how they are causing a blocked DPF. The main reason for DPFs failing is due to car owners not doing enough miles and driving too frequently in city areas. How long until a DPF will fail is hard to tell because some manufacturers have had to replace some in the first 3 years and some never. The most common reasons for DPF failures are: Short journeys where the engine doesnt reach optimum operating temperature Clogged EGR Valve increasing diesel soot passed to the DPF Faulty fuel injectors sending too much fuel to the airfuel mixture Incorrect engine oil upon servicing the car ( Low Ash Low Sulphur required for DPF Cars) Turbo failing with oil dripping into the DPF High mileage car that will find regeneration harder Symptoms of a Block DPF Filter As the majority of DPFs are installed on newer cars, you will more than likely have a trip computer. Error codes such as the DPF light or EML (Engine Management Light) will be the first symptoms of a failing DPF.
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