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https://www.boards.ie/discussion/2055940817/signature-rules

Too frequent dpf regens

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Comments

  • #32
    yamaha4life
    Registered Users, Registered Users 2 Posts: 363 ✭✭yamaha4life


    Audioslaven wrote: »
    DIY. It takes me about 40 minutes to remove. I use high volume of water rather than pressure. I always backwash and close off the DPF/Cat sensor holes. Leave it over night to drip dry , refit and let the car idle till all water is pushed out.

    On the mazda, the filter was really bad so I set the ecu that it had a new DPF. Its been two years and the Mazda has no issues since with DPF duration and fuel economy increased back to 250KM / 60MPG

    Just water? Hoze or powerwasher? No chemicals needed?

    Very interested


  • #33
    Audioslaven
    Registered Users, Registered Users 2 Posts: 1,463 ✭✭✭Audioslaven


    yamaha4life wrote: »
    Just water? Hoze or powerwasher? No chemicals needed?

    Very interested

    Just water with a 3 inch hose on a pump. It does not have high pressure just pushes alot of water through. I have heard of a chemical that I might use the next time. I dont have the name of it at the moment but I have heard that leaving it in it over night can also give good results. So far I have used water and this has worked really well for me


  • #34
    Sexual Chocolate
    Registered Users, Registered Users 2 Posts: 2,060 ✭✭✭Sexual Chocolate


    zg3409 wrote: »
    DPF cleaning only removes black stuff soot, not red stuff ash. When it is full with ash it needs to be replaced and old one recycled. The "companies" offering cleaning services give no guarantees, and only remove soot, which if you do the odd long run should be removed during a regeneration.

    Anyone else able to share any experiences with dpf cleaning ? Lots of conflicting information about it.

    A back pressure fault code returned the other day after having the sensor replaced 4k km ago so my mechanic is recommending to have it sent off to a company down in Killkenny to be cleaned if I didn't want to go down the delete road which I'm trying best to avoid.

    I've attached an image of the description of the fault code below, not sure of the seriousness of it.


  • #35
    yamaha4life
    Registered Users, Registered Users 2 Posts: 363 ✭✭yamaha4life


    Depends what car / engine. I had fault pressure too high amoung others relating to dpf in my volvo s40 2.0d with additive tank. The one or both hoses going from dpf to pressure differential sensor were blocked up with sooty carbon. I swapped them out and cleared the faults and the car was perfect there after apart from message on dash to top up additive tank. It was great to have car out of limp mode.


  • #36
    zg3409
    Registered Users, Registered Users 2 Posts: 7,327 ✭✭✭zg3409


    Sexual Chocolate wrote: »
    Anyone else able to share any experiences with dpf cleaning ? Lots of conflicting information about it.

    A back pressure fault code returned the other day after having the sensor replaced 4k km ago so my mechanic is recommending to have it sent off to a company down in Killkenny to be cleaned if I didn't want to go down the delete road which I'm trying best to avoid.

    I've attached an image of the description of the fault code below, not sure of the seriousness of it.

    What car, what mileage, what age, what engine type/size?

    Back pressure faults typically happen when one of the hoses from before or after the DPF breaks. They typically break as they harden due to age but also when the DPF is full the engine puts lots of pressure into the hose.

    The hoses run to a differential pressure sensor, which guesses how blocked the DPF is, based on difference in pressure. 0 pressure means one of the hoses is broken

    I assume your mechanic knows a bit about this, but cleaning is only really for cars doing short trips with low mileage. Over 150,000km means the DPF should be replaced or Deleted (which should fail NCT if they notice).

    Replacing the hoses with a bad DPF will cause them to break again.

    Another thing that can cause DPF blockage on low mileage cars is anything that causes the car to create abnormal smoke and soot such as a faulty injector or a badly running engine.
    Even with a good DPF system the DPF will become re-blocked in no time.


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  • #37
    Sexual Chocolate
    Registered Users, Registered Users 2 Posts: 2,060 ✭✭✭Sexual Chocolate


    2008 E90 320d, 173k kms.

    I'll look into the hoses when I'm off work one of the days if I can.

    Can't remember if I mentioned it already but when I got the car the glowplug module was showing a fault code and as far as I know BMWs won't regenerate if there's a module fault or more than 2 glow plugs showing faults. Wouldn't of helped things at the time I suppose, though I was quick to have it replaced.

    Unless I was able to get a new dpf for about 500-700 quid I'd consider it but otherwise id be getting rid of it if it was going to cost more than that.


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