A Diesel Particulate Filter (DPF) is designed to remove diesel soot from the exhaust gas of a diesel engine so they are not released into the atmosphere. A DPF can remove upwards of 85% of the particles from the exhaust, The DPF physically captures the soot and ash particles in a honeycomb like structure
The vehicles (ECU) constantly monitors the filters sensors and will carry out a regular cleaning process called "Regeneration" to stop it blocking. Regeneration, either active, passive or forced regeneration, burns off the accumulated soot at high temperature by advancing the timing (to around 600°c) to leave only a residue of ash that is then blown trough the exhaust as you drive, effectively renewing or regenerating the filter, ready to take on more pollution from the engine.
I diagnostics, checking that the components and sensors are functioning correctly before performing a DPF clean incase of a sensor failure. Where necessary, further investigation is carried to ensure a successful clean.
2: The Cleaning Process
Using our special cleaning solusion, it is injected into the pre DPF pressure line and the soak period is now initiated. The engine is then ran at a fast idle allowing the soak fluid to clean the carbon content in the DPF. This is then followed by a further injection of a cleaning flush solution during an engine fast idle cycle and we carry out the flushing process twice.
3: Drive the Vehicle
drive the car for 20 minutes making sure that the rest of the flush fluid is expelled from the car.The diagnostic is plugged in and the data is checked to make sure that the DPF is now working correctly.
4: Live Data and Analysis
Finally, live data is analysed during a road test or DPF regeneration. This is then followed by final parameter checks logging DPF back pressure readings. These readings, before and after, are then reported back to you for your peace of mind
When driving, soot settles on the walls of the filter and starts to clog the pores of the filter. This layer of soot can be burnt off during the regeneration process of driving at constant speed for a prolonged period of time, such as motorway driving. But during short journeys or city driving, diesel cars do not reach the required exhaust temperature to allow regeneration to take place. If this continues to happen and regeneration is no longer sufficient to clear the blocked filter, motorists can face some very expensive repair costs, typically to replace the dpf filter will cost over £1000 for a new replacement.
When the DPF warning lamp comes on check your owners handbook to see what the manufacturer suggest to promt your vehicle into a regeneration cycle normally it’s a run on a faster road such as a dual carriageway or motorway. Driving at 40mph or more for 10 minutes should prompt the DPF to go into ‘regeneration’ mode and burn off soot which should clear any blockage.
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