DPF (FAP) off

DPF (diesel particulate filter) is a device on vehicles that has the task of reducing the level of harmful emissions of diesel engines with internal combustion. The basic principle of functioning of DPF is the retention of soot that occurs during engine operation and subsequent ejection of ash (occurs during regeneration and combustion of soot) and soot when the conditions for that are met, ie. regeneration. The DPF cannot destroy the ash because once it has already burned it cannot burn again, so it is actually a "reservoir" for ash and soot that collects during city driving and then starts regeneration on the highway and throws it out. The DPF actually serves to ensure that the vehicle does not pollute the city and populated areas, but to emit ash and soot on open roads where it is considered to be less populated. All the ash is difficult to remove by regeneration so that over time the filter fills with ash and when it crosses the critical limit then intervention on it is required. (replacement, cleaning, removal)

The factory designs it to serve from 150,000 to 200,000 km, and how long it will last depends exclusively on driving conditions, so that vehicles that drive a lot in the city often do not meet the conditions for regeneration (open driving over 3000 rpm) and the filter will filter much faster. to "clog" against vehicles that drive a lot on highways over 3000 rpm because with them the conditions for regeneration are always present and the filter can easily be emptied when it is filled with soot.

The most common symptoms of spoiled DPF are:

  • Restless operation of the engine at idle and increased idle
  • The "duller" sound of the engine at idle
  • The appearance of gray-white smoke while the engine is running in place
  • Lower engine power with excessive exhaust fumes
  • Limiting engine power (safe mode, limp mode)
  • Appearance of MIL lamp (check engine lamp)
  • Higher fuel consumption
  • Termination of DPF regeneration
  • Errors related to EGT probes and differential pressure
  • Occurrence of oil in engine oil which leads to mechanical destruction of the engine due to poor oil viscosity

There are several ways to solve the DPF problem:

  1. removal and cleaning - if the problem is in a minor mechanical blockage this may help but if the problem is of an electronic nature in the sensors themselves, cleaning will not help
  2. used DPF- the rule is the same as for any used item, it can take a long time and it can break down again the next day
  3. new DPF with all sensors - this will certainly solve the problem but the cost of this repair is extremely high
  4. deregistering the DPF from the motor computer and removing it mechanically - for sure, the only permanent solution to all the problems that the DPF can cause

With the correct and quality DPF off, the engine will work completely correctly without any lights, errors or limp modes. Also, the exhaust temperature will be much lower because nothing will "choke" the engine, thus there will be more engine power at the same settings with the DPF. The regeneration process will be permanently stopped, so vehicles that use additives will not have to connect them. Lower exhaust temperature will have a positive effect on the service life of the turbine, exhaust manifold, head valve ... During the technical inspection, DPF off will not be noticed and the vehicle will be able to pass all ECO tests.

The disadvantages of DPF check-out are the slightly noisier engine and the possible slight appearance of smoke on the sudden squeezing of the accelerator pedal to the floor (this is usually the case in older vehicles where the nozzles are already worn out).

SM chip tuning can provide you with quality and professional DPF off on any of ours address.