How much ash should be in a DPF?

Ash fraction = ash/(ash + soot) at a soot load of 6 g/L. Based on Figure 1, after only 33,000 miles (53,000 km) of on-road use, approximately 50% of the material accumulated in the DPF is ash . In other words, the amount of ash equals the amount of soot at the maximum allowable soot load limit of 6 g/L.

What is the difference between ash and soot in DPF?

Soot -v- Ash Soot is combustible and can be burnt off. Ash is incombustible and must be removed from the DPF through an off-vehicle cleaning process.

Can you remove ash from DPF?

Suction should also be applied at the bottom of the DPF to help remove any ash or debris . Once your filter is pressurized, it needs to be cleaned. You may have to do this process again to remove any remaining soot or ash that wasn't dislodged in the first attempt.

What is too high for DPF soot level?

If the driver doesn't take the appropriate action, however, the soot accumulation reaches 75 % and another warning light should appear. In this stage, the car needs a 'forced' regeneration, which can only be undertaken by a dealer or workshop. Without forced regeneration, soot accumulation will reach levels above 85% .

What should soot level be before regen?

The active regeneration of the particulate filter occurs when the soot level in the DPF is around 40-45 % of its capacity .

How do you purge soot from the DPF?

Try these methods: Add a particulate filter cleaner. ... A pressure gun and compressed air can remove loose ash in the filter but not the stuck soot particles. Pressure-wash the DPF filter with heated water, spraying in the opposite direction of the exhaust flow. If all else fails, schedule service at our service center. Feb 4, 2022

What Colour smoke is a DPF regeneration?

Blue smoke coming from your exhaust or DPF during regeneration comes from the burning of engine oil.

What is a normal DPF soot load?

Soot Load Percent and Regen Cycles The engine controller reports the DPF soot load as a value from 0% to 250% — not 0% to 100% as you may expect. The value may fluctuate, and this is normal. Here's what those percentages mean: Above Soot Load 78%: Reset regeneration is activated by the engine ECU.

How many grams of soot are acceptable in a DPF?

26g/m3 of soot is not alarming, soot increases as you drive your car (at a higher rate if you drive in town and slower rate if driving on the motorway), eventually the active DPF regen will start when the soot mass reaches around 30g/m3 and decreases down to 4g/m3 on a complete regen on the motorway.

What is an acceptable soot level?

Excess soot can have an abrasive component and has the ability to stick to wearing surfaces, potentially increasing oil consumption. A used sample from a Volkswagen 2.0L TDI. Soot reads at 0.4%. We like to see soot at 1.0% or less ; anything higher than 2.0% to be cautionary.

What should DPF values be?

At idle, the differential pressure should be "0" mbar . Whenever the throttle is opened properly, the differential pressure increases and then returns to the old idle value. 4-7 mbar at idle is not a particularly high value - the increase to 200 mbar when accelerating is quite high.

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