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Thread: Diesel Particulate Filter Query / Clarification

  1. #1
    Regular Member dave45040's Avatar
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    Default Diesel Particulate Filter Query / Clarification

    Hi all,

    Hope someone can help.

    Have had my (MY06) Signum Elite 1.9Cdti (150) for about 4 months now and, the majority of this time it has not been the best engine I have experienced (and certainly not as trouble free as my Signum 2.2dti was previously). I have probably just done about 3000 miles since I got it, and there is approx 11000 miles on it at present.

    The only 3 times that I can remember the car running as I would expect (with no hesitation & with smooth acceleration) is when it has been back to the dealers and they have 'regenerated' the DPF.

    The third time this was done was today, so - touch wood - it should run OK for some time now.

    The only time that I have seen the car tell me that it needs to clean the PDF (i.e. the preheating light flashing slow etc) was the day AFTER the PDF was regenerated for the second time about 6 weeks ago.

    Slowly but surely, since then, the car had become sluggish, started to 'miss' (about once per day) and not been a pleasure to drive, hence why it was booked in today.

    The dealers have said that when this happens again I should take it back in, as there is nothing else they can do, which is difficult to believe in this modern day of technology. To be fair though, they are usually very helpfull - probably cos I dont go in ranting and raving!!!!!!!!!!!!! They even joked that I should have a block booking made on the last Friday of each month so that they can regenrate it on a regular basis.

    What I would like to know is:

    How often should the DPF be cleaning itself?

    Should the DPF be regenerating itself and, if so, how often?

    If it is cleaning itself and regenrating itself properly, would this eliminate the need for me to keep having it regenerated at the dealers?

    What is the difference between it cleaning itself and regenerating?

    Is anyone else out there having similar problems to me?

    Sorry for the long thread but I thought that if I stated all the facts, someone out theer may be in a better position to diagnose for me!

    Dave

  2. #2
    Regular Member VectraV6CDTi's Avatar
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    Quote Originally Posted by dave45040 View Post
    They even joked that I should have a block booking made on the last Friday of each month so that they can regenrate it on a regular basis.
    They really are taking the pi55. If everyone with DPF's had the same problems Vx garages would be flooded every week with customers.
    Take it somewhere else and find someone who can actually fix the problem rather than working around it.

  3. #3
    Regular Member ukanalyst's Avatar
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    This maybe of interest if you haven't already seen it:

    http://forum.vectra-c.com/showpost.p...4&postcount=33

    and also this:

    http://forum.vectra-c.com/showthread...ghlight=recall

    Dave

  4. #4
    On a Sabbatical VauxVeteran's Avatar
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    Isn't it advisable to give it a good blast down the motorway every two weeks to clean it.?

  5. #5
    Regular Member Gsi3.2's Avatar
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    yep.. they reckon a good 25 minute run to let it acheive the temperatures needed to burn off the particulates.... seems a lot of trouble is down to shorter, colder urban usage..

  6. #6
    Regular Member dave45040's Avatar
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    As a fair majority of my mileage so far has been local running around, I also thought that this might be the case but, even after a round trip of some 250 miles it didn't seem to get any better.

    Has anyone else noticed with what regularity their DPF cleans itself?

    Apart from asking the dealers, does anyone know if there is anywhere that I could find out if my DPF is one of the ones which is the subject of a recall?

    Thanks again

    Dave

  7. #7
    Regular Member Gsi3.2's Avatar
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    if you've not had a letter , then i'd make a call and just ask them if your car comes under the range of those wanting work..

  8. #8
    Regular Member VectraV6CDTi's Avatar
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    Quote Originally Posted by dave45040 View Post
    Has anyone else noticed with what regularity their DPF cleans itself?
    I think my car should have a DPF but not sure when its cleans itself. Has never given any indication on the dashboard.

  9. #9
    Regular Member ukanalyst's Avatar
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    it's all in the documentation in the link ... I relaise it might look a bit scary so here's the bit about how often it regenerates:

    The decision on whether, and if so when, regeneration has to take place must be made by two different software applications:
    • Supervisor software
    • Manager software

    ---

    Regeneration Process
    1. Supervisor software
    2. Manager software
    3. Regeneration
    4. Regeneration is to take place
    5. Monitoring of the regeneration

    The Supervisor software decides on the basis of the following parameters whether regeneration should be carried out:
    • Soot load of the diesel particulate filter (value of the
    DPF differential pressure sensor),
    • Distance travelled
    • Operating conditions
    • Favourable conditions for regeneration
    • Probability of improved conditions in the near future.

    By taking these parameters into account, it is possible to achieve minimum fuel consumption levels, minimum oil dilution and optimum performance whilst the vehicle is being driven.

    If the supervisor software makes the decision that regeneration should be carried out, the manager software is informed.

    The Manager software monitors the regeneration process and constantly interrogates the following inputs:
    • Coolant Temperature
    • Fuel Temperature
    • Exhaust Gas Temperature
    • Manifold Absolute Pressure.

    After the supervisor software has enabled regeneration, the following actuations occur in two stages:
    Stage 1:
    • Shut-off of the EGR system
    • Actuation of the turbocharger guide vanes to deliver maximum boost pressure

    Stage 2:
    • Closing of the throttle intake valve
    • Advanced post-injection
    • Retarded post-injection.

    If regeneration has commenced it will be completed, regardless of the operating condition of the engine. Regeneration can only be stopped by shutting off the engine. Regeneration is started again once acceptable operating conditions are detected by the system.
    Regeneration takes a maximum of 20 minutes"-
    The post-injections result in high oil dilution and must therefore be kept within limits.

    To avoid excessively high oil dilution, a minimum driving distance has to be maintained between two regeneration cycles approx. 217 miles (350 km).

    Note: Increased oil consumption and reduced fuel quality (high sulfur content), as well as high fuel consumption accelerate the build-up of ash in the DPF, shortening regeneration intervals more quickly.

    If the minimum distance between regeneration cycles, currently 217 miles (350 km), cannot be adhered to, this is detected by the diesel particulate differential pressure sensor, and the DPF warning is switched on. The DPF will require a drive cycle forced by the WDS.

  10. #10
    Regular Member willc01's Avatar
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    I have had several problems with my DPF. Regeneration takes place anywhere between 250 &1750 miles. I have done 10k in 4 months so have bee timing it. How do I know, well the feul consumption is increased 2fold. and lasts for between 8 & 17 miles motorway driving. Consumption during regenartion drops from 45ish mpg to 23mpg. If I pull over on idle the instant consuption is 1 g/hr as opposed to 0.2.

    I have had my DPF replaced and the dealer belives that my injector problem is also linked to the DPF. It is due in to have the injectors replaced in 2 weeks. Have you checked to see if your chassis is on the recall list?

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