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Thread: Diesel Partical Filter

  1. #1
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    Default Diesel Partical Filter

    I got my 1.9 CDTI 120 in at vauxhall today(it's spent most of last fortnight there), they say current problem( limp mode and spanner+car symbol on dash) is down to the DPF. £60 for new one + I persume fitting and diagnosing time.

    My question's are :-

    1) what does DPF do?

    2) Why does it need changing? Vauxhall say it's 85% full?

    3) Is it caused by cars previous faults?
    i.e
    25/03 - Big hissing noise at 1800rpm no power,
    26/03 - In at vauxhall, diagnose split Intercooler.
    28/03 - Warrenty ran out.
    30/03 - new intercooler fitted (done 10miles since first problem) under warrenty.
    02/04 - Collect car 3pm
    02/04 - 10pm car break down, bang, hissing no power, car recovered home( done 4 miles since collection )
    03/04 - Car towed to Vauxhall - Hose come off - fixed under warrenty. collected 11am.
    03/04 - Car in limp mode, no power, towed home, ( done 3 miles since collection )
    04/04 - Car towed to closed Vauxhall, Parked in there car park blocking carpark.
    06/04 - Vauxhall diagnose DPF full at 85%
    07/04 - Hope to pick car up.... wait and see

  2. #2
    Regular Member Dose's Avatar
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    A diesel particulate filter, sometimes called a DPF, is a device designed to remove diesel particulate matter or soot from the exhaust gas of a diesel engine. Wall-flow diesel particulate filters usually remove 85% or more of the soot, and can at times (heavily loaded condition) attain soot removal efficiencies of close to 100%. A diesel-powered vehicle equipped with functioning filter will emit no visible smoke from its exhaust pipe.
    In addition to collecting the particulate, a method must exist to clean the filter. Some filters are single-use (disposable), while others are designed to burn off the accumulated particulate, either through the use of a catalyst (passive), or through an active technology, such as a fuel burner which heats the filter to soot combustion temperatures, through engine modifications (the engine is set to run a certain specific way when the filter load reaches a pre-determined level, either to heat the exhaust gases, or to produce high amounts of NO2, which will oxidize the particulates at relatively low temperatures), or through other methods. This is known as "filter regeneration". Sulfur in the fuel interferes with many "regeneration" strategies, so almost all jurisdictions that are interested in the reduction of particulate emissions, are also passing regulations governing fuel sulfur levels.

  3. #3
    Regular Member LADmachining's Avatar
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    A new DPF costs a lot more than £60. Even £600 is cheap.

    If the vehicle is used for lots of short journeys, such as round town stop-start driving, the system does not get the opportunity to carry out the filter regeneration (cleaning) cycle. This needs the engine to be revved at about 2500+rpm and takes 20minutes. This usually occurrs on the motorway.

    If the DPF gets too full, the system cannot carry out a regeneration. Vx can initiate a manual regeneration, but even this can fail if its too blocked. There have been reports that people have taken the DPF off the vehicle and steam cleaned it to remove the built-up soot. This is an unofficial repair - the official course of action according to Vx is to replace.

    A fault in other engine management components, such as the EGR valve, can cause excessive soot generation, which will clog the filter more quickly. Loss of boost due to a split intercooler will make the engine smoke more, but will take a long time to fill the DPF - longer than you could drive with no boost pressure!
    Last edited by LADmachining; 7th April 2010 at 07:44. Reason: typos

  4. #4
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    Car had a regeneration, just wondered if above faults had caused excessive soot?

  5. #5
    Regular Member LADmachining's Avatar
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    As I mentioned, a split intercooler will cause the generation of excessive soot.

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