Why DPF Cleaning is Important
Why does a DPF get dirty?
A DPF otherwise known as a Diesel Particulate Filter is located within the exhaust system usually near the Catalytic Converter.
The DPF is responsible for removing diesel particulate matter (soot) from the exhaust gasses of a diesel engine vehicle.
Short trips with a lot of stop & starts is the biggest cause of DPF’s becoming blocked, along with the poor quality of diesel in Australia it doesn’t take long to block a DPF.
In order to clean the DPF, which is continuously accumulating soot. Carbon deposits need to be burnt off, this is done by raising the temperature of the exhaust gas at the inlet of the filter.
During regeneration the exhaust gas temperature is regulated precisely by the ECU.
To prevent a DPF from getting clogged or dirty which constantly makes the engine run rough, it must be regenerated regularly. This is done by burning off the soot that has accumulated inside the filter.
Different Types of Regeneration
Passive Regeneration is a process where as the soot particles are steadily burnt off without the intervention of the ECU. This occurs when you are travelling at highway speeds and usually around 3000 RPM. The temperature of the exhaust gas will reach around 660 degrees Celsius.
Active Regeneration is where exhaust gas doesn’t reach temperature for Passive Regeneration, consequently, soot particles are not eliminated and instead accumulate inside the DPF.
When the DPF is clogged a threshold of 18 grams is reached and the ECU will do an Active Regeneration.
Cleaning a DPF
There are two ways to clean a DPF
First is out of vehicle which is a costly and time-consuming option. First you have the labour involved in removing the DPF and then taking it to the cleaners. After 24 to 48 hours you will get it back only to have to re-fit it onto the vehicle, average cost involved about $1200 vehicle dependant.
Second is in vehicle where we use a special chemical that cleans then flushes the DPF and takes 1 to 2 hours. When doing this we also recommend a Carbon Clean at the same time. Total cost $650.
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