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Thread: Egr??? Dpf???

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    Full Member hothatch's Avatar
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    Year : 2012

    Default Egr??? Dpf???

    What is the EGR Valve & DPF? And what do they do?

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    Regular Member lee1828's Avatar
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    Quote Originally Posted by hothatch View Post
    What is the EGR Valve & DPF? And what do they do?
    EGR is exhaust gas recirculation valve and DPF is a diesel partical filter. EGR valve reuses exhaust gases and the partical filter removes harmful particals from diesel fumes.

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    Full Member gibbon7000's Avatar
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    Knack you car up

    My other car. 1972 1641cc slammed beetle. On the road finally!!

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    Regular Member lee1828's Avatar
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    couldnt put it better myself

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    Regular Member Aikon58's Avatar
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    Quote Originally Posted by hothatch View Post
    What is the EGR Valve & DPF? And what do they do?
    EGR puts cr@p back in the intake of the engine to reburn and the DPF gets clogged up with the cra@p that comes out of the exhaust.
    The EGR is meant to reburn exhaust fumes again,which is why it is open on tick over for when it's in towns or traffic.
    The DPF is meant to cut down on the emissions on the auto and estate cdti,but i can't see the point of it if it's only going to let all the built up emissions inside the DPF out all at once in a plume of fumes

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    Full Member hothatch's Avatar
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    I see now. I hear that some people remove the egr valve or blank it out, removing it would it cause damage to the engine in the long run.

    What about boost sensor? i hear that people clean these out quite often.

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    Regular Member Big Knox's Avatar
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    my understanding is the EGR is for emissions purposes only so removing it wouldn't harm the engine. it'd need blanking off and the you can either disable it in the ECU or tue the solenoid up somewhere so it still operates therefore avoiding EML.

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    Also while the EGR valve reduces NOx by recirculating exhaust gases at low rpms, it subsequently increases particulates. DPF reduces these.

    NOx emmissions are greater at lower rpms due to the large Air to FUel ratio in deisels as deisels are not throttled. The extra Oxygen combines with extra Nirtogen at high temperatures - producing Nitrogen Oxide (NOx). Exhaust gases recirculation 'dilutes' the mixture is one reason for the cooling effect of the exhaust gases.

    Gazza4

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