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Thread: How often should the DPF regenerate?

  1. #1
    Regular Member Blagmeister's Avatar
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    Default How often should the DPF regenerate?

    Been reading a few threads on this beastie and am a little concerned that my DPF might not be working properly, with nasty and expensive consequences.

    My vec 1.9 150 Estate has 94K on it and I bought it at 88K, so its done a fair few miles since I had it. It does a mixture of driving from taking the school run to a couple of fast runs on the M/Way during a week. Mostly though, it gets tickled around relatively gently. Even on the MWay, it sits in top at an indicated 75mph doing about 1500rpm.

    The manual says the glowplug light should flash whilst its doing it but at no stage have I been aware of it going through this process.

    Is this normal?
    Am I worrying over nothing?
    Should I get it checked out with the stealer?
    Why is there only one Monopolies Commission?

    Any advice would be much appreciated.

    Thanks

    Phil

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    [Ex]Admin Duncan's Avatar
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    Have you had the software update that makes the DPF regenerate more often? If not then that'd be the first step.

    As for the light on the dash, I've lost track of what model years did show and which didn't. Basically at some point Vx stopped having it that the light came on during a regen as (some) people thought it was a fault and trundled off to their dealer - when all it was doing was indicating a regen. Being an 05 though I'd have thought it was before they made the change.

    You'll know when it's doing a regen, your instant mpg will go through the roof and I think it feels a bit sluggish.

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    Regular Member parapaul's Avatar
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    The glow plug light never flashes - I don't know why that's in the manual. If you're doing a fair chunk of motorway miles then it perhaps doesn't need to regen yet - it's the stop/start town traffic that clogs it up.

    If it regens on the motorway you won't notice at all, the only thing you'll see is your inst consumption dropping from 40-50 down to 20ish. If it decides to regen around town, you'll hear the exhust note change on acceleration, almost like it's starting to rust through, consumption will struggle to make it above single figures, and if you're going slow enough you'll smell bonfires following you

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    Regular Member Blagmeister's Avatar
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    Thanks Duncan and Paul, for the prompt reply.

    I would think the s/w update has been done unless it came out in the last 8 months or so. I spoke to Duerdens this morning who serviced the car up to 85K [the last one was done on 16/6/08] and they confirmed verbally that all recalls and updates had been done.

    Do you think it should have done one within the last 6K as I can't say I've noticed any of those symptoms?

    Cheers

    Phil

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    what do DPF regenerate mean

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    I might not be 100% correct but I will try to explain abit about flashing glow plug sign. Vx has developed a strange measurment for DPF soot level indication with diagnostic equipment. With normal (mostly highway) driving the soot level is 20%...100%. The regeneration wants to take place from 95% on. When doing a lot of city driving, idling and lots of engine strting/stopping the normal regeneration is being postponed. When ~110% level is reached the glow plug sign starts to flash - meaning DPF is dangerously full and you need to take a highway drive. During that drive better to keep engine above 2500 rpm untill flashing stoppes = regeneration has been finished sucesfully. When you still dont go to highway then on about 125% most probably check-engine light comes on. At that time the automatic self-regeneration will not work any more and you have to take the car to dealer who can force the car to make service regeneration with tech2. Over 130% most probably the DPF is fataly clogged. Although I most say that I have seem Opel Meriva Z13DTJ with 155% soot and a service regeneration did clean it out :O to my surprise. It might be because vx has different calibrations for different engines though.
    The % is a calculated value not a real sool level in DPF. The level raises most slowly with constant speed highway driving. Level increasis most rapidly in city driving with cold engine. Every cold start adds 1-2%.
    Hope this help you guys better understand the DPF.

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    Regular Member Grimo72's Avatar
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    the only way you can tell its running is car fills a bit sluggish and it smells like an egg factory

    the light on dash (this is my understanding) when it is almost full and this means you need to go for a long hike up the motorway so it can clear itself

    hope you never see the light as it means it is very full


    oops a bit late

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    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

    Trim : Black

    Engine : 3.0D V6

    Year : 0000

    Default

    Do the DPFs have a oxidation cat upstream and use 'free' passive regen using NO2 above about 250 Deg C, or ONLY use active regen (ie late injection event), using O2 and temps above about 550 Deg C?

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    AFAIK diesels only use oxidation (2 way) cats and use EGR to reduce NOx.

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    Vectra DPF has a pre-cat upstream the DPF. Regeneration is initiated with late injection and the temp increases to ~650 deg C in the DPF during the regen process.

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