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Thread: jiddering and poor mpg

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    Default jiddering and poor mpg

    Just wondering if anyone could help I've had my car about 2 months now and this has happend 3 times, so I'm just driving normal then all of a sudden the instant mpg goes to about 20 mpg where I'm useually getting atleast 40 and then when I stop at lights you feel a very noticable judder as if its misfiring but it seems to have power as normal, switch the car off and all is fine again also no warning lights come one while this is happening my car is a 2005 1.9 cdti sri 120 estate if that help, many thanks

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    Regular Member Ben50n's Avatar
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    Is it the DPF recycling?

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    I haven't got a clue mate, I did have to get my dpf cleaned on my laguna, do you think that coluld be the problem?

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    Regular Member Ben50n's Avatar
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    Could be or the EGR valve needs a clean, I am sure some of the Diesel heads will be along to help.

    This is just what I have picked up from reading countless threads about misbehaving diesels....

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    Okay thanks mate hopefully will come along an shed abit more light on it

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    Moderator & Events Assistant paulhb's Avatar
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    Vehicle : M5

    Trim : Nothing needs adding

    Engine : 5.0 V10

    Year : 07

    Mileage : 37000

    Default

    Check the door piller on the drivers side and look in the bottom right hand corner for the following 1.30 for DPF not present and 0.8 for DPF present. If your car isn't an automatic it may not have a DPF best to check first

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    Sounds very much like a DPF regeneration - I think most 1.9 Estates have DPFs as it's something to do with tax on company vehicles.
    paulhb, you probably know better than me, but I thought it was 1.20 for no DPF fitted and 0.50 for DPF fitted?
    If you have a DPF, then the regen cycle works on a differential pressure sensor which is basically looking for a restriction of exhaust gas across the DPF (the section of the exhaust which is collecting particulates from your exhaust gases). When the restriction is high, it forces a regeneration (a late additional post injection which uses more fuel).
    Also, from what I understand, it can also be triggered by some sort of equation within the ECU which takes into account journey duration and miles completed - could be wrong on this one!
    Either way, I don't think it's unusual to see this every couple of fuel tank refills.

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    Thanks for the help DieselWig and paulhb, I think you may be right DieselWig as my car does have 0.50 on the door piller I'm glad to hear that this can be common because I had a nightmare with the dpf in my lump of s*** laguna just took a differant route home from work with a little motorway run so that should help a little

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    Moderator & Events Assistant paulhb's Avatar
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    Quote Originally Posted by DieselWig View Post
    I thought it was 1.20 for no DPF fitted and 0.50 for DPF fitted?
    You are right mate for the 150 but on some 120 models they had different numbers (in my post) and the OP has a 120 but at least the numbers tally to show he a DPF and that it is the likely cause

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    Default

    Thanks for the help everyone

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