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Thread: D p f

  1. #1
    Regular Member DAVIDD88's Avatar
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    Default D p f

    Can someone explain regens etc I know why its there the reason I ask is this morning went a drive some town/bypass when I went to park up it sounded as if the exhaust was rumbling but turned it off anyway then went back out and would not start the spanner light flashed so turned it off and on and it started so took it a long run mpg was crap and stationary was 0.7 its normally 0.1 now after the run the rumbling is away and stationary is 0.1 but there's a burning smell which I'm thinking is the dpf as it burns at 600 f so just to ease my mind I wanted opinions thanks

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    North West Regional Organiser paulvectrac's Avatar
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    Just forces the crap out mate by heatin it up very hot
    Vectra vxr custome remaps egr deletes dpf and diagnostic work all remaps are custome bench tuning avalible all genuine equipment PM for info

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    Regular Member DAVIDD88's Avatar
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    Yes but does what I said sound like a regen

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    Regular Member DAVIDD88's Avatar
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    Default

    Anybody

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    Vectra-sport Admin Dre's Avatar
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    Default

    It does sound like the regen especially as your instant went to .7

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    Regular Member DAVIDD88's Avatar
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    Thanks I though it was

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    Regular Member barney490's Avatar
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    Default

    Are you sitting comfortably,, then i shall begin, grins...

    Basically what is happening during this process, is that the engine's computer has decided from the information that it receives from the sensors installed in the exhaust, that the DPF has filled up past its acceptable limit. The computer then closes the EGR (exhaust gas recirculation) to help get exhaust gas temps higher and also injects a small shot of fuel into the cylinders when the exhaust valves are open, hence increase in fuel consumption. The raised exhaust temps, up to 600 degrees Celsius, and the small amount of fuel then burn out the particulate (soot) that the DPF has collected since its last regen.
    Once regeneration starts the ECU then needs to see the correct value readings from the pressure sensors in the exhaust that the filter is flowing an acceptable limit again, it ends the regen cycle. It is not good practice to switch off any car whilst the regen process is running it’s cycle. Typically if this happens, the car will attempt another regen the next time the engine is started and reaches temperature. Problems arise after several interrupted regen cycles, this causes the DPF to block, bringing on the EML and entering limp mode. Quite often the car will no longer attempt another and usually needs a forced regen via tech2 or similar, however a hot fast motorway run at 70 in 5th may force a regen and clear the problem. During this run, observe the instant mpg which will be very low as the regen takes place and rises to expected levels, once regen is complete.
    The main factors causing DPF issues are short cold runs, faults in the vehicle fueling system or using the wrong specification engine oils.

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    Regular Member barney490's Avatar
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    Annnnndddd a double post, grrrrr

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    Regular Member DAVIDD88's Avatar
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    Thanks mate that answers everything I take it the exhaust gets loud as the egr valve is closed

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    Regular Member barney490's Avatar
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    Your very welcome. The exhaust note does change, but as you have seen, the big giveaway is the fuel consumption and sometimes you can actually smell the heat from the DPF.

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