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Thread: EGR Question about blanking

  1. #1
    Regular Member winnie2457's Avatar
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    Default EGR Question about blanking

    hi guys and a happy new year.

    i have just took off my egr and give it a good clean out and also scraped out all the gunk in the inlet manifold where the egr attaches to the inlet manifold. if i blank off the inlet manifold with a homemade blanking plate would this work or would the eml light come on.

    also is the egr sensor in the inlet manifold or in the egr valve itself and what triggers the eml light is it temp or lack of flow??

    if i made a blanking plate with a 6mm drilled hole in would this be enough flow to stop the eml light cummin on????

    help needed as im getting the inlet manifold replaced under warranty and dont want it to clog up again.


    any help guys thanks

  2. #2
    Regular Member the-wizard's Avatar
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    Vehicle : vectra-c

    Trim : sri

    Engine : cdti

    Year : 2004

    Mileage : 98,000

    Default

    have a browse through the how 2's, think you have to put about four holes in the blanking plate. http://www.vectra-c.com/forum/showth...g+plate&page=2



    try that link it has pics.
    Last edited by the-wizard; 2nd January 2010 at 19:24.

  3. #3
    Regular Member winnie2457's Avatar
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    Default

    thanks for the link but i have still not found out what actually senses the egr flow is it the egr valve itself or is there another sensor in the inletmanifold that senses the flow??? as if it the egr valve then surely you could block it completely at the inlet manifold. or does the egr valve actually have a flow meter built in to it so it can monitor the flow through the valve ???? has anyone tried to block it completely at the manifold end??????

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    Regular Member spatch's Avatar
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    If you blank it you will get an error code. I have a restrictor plate with 2 off 5mm holes in it. I have never got an error code up in over 6 months. I have toyed with the idea of one 6mm hole but have not got around to making another plate.

    My understanding is that there is a pressure transducer in the induction system that detects if there is not enough EGR flow. This is what generates the alarm. If the flow is too low (or blanked altogether) then there is a pressure discrepancy, hence an error.

    Not sure where it is though.

    Mark

  5. #5
    Regular Member winnie2457's Avatar
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    thanks i was thinking have had a look on here how to find out but what you say is logical i was just wondering if any one has found where this pressure transducer is????

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    I think it is more related to O2 sensor or similar sensor that will detect an error if EGR is blanked completely.

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    I think the MAP (manifold absolute pressure) sensor detects the differing pressure between normal pressure and with EGR valve open at any given engine rpm.

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    Regular Member winnie2457's Avatar
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    silly quesion is the map sensor the same as boost sensor??

    also once the egr valve opens i thought this was only at low revs before the turbo kicks is as surely the manifold pressure on full boost will over power the flow from the egr????

    or am i wrong??

  9. #9
    Regular Member spatch's Avatar
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    Quote Originally Posted by winnie2457 View Post
    silly quesion is the map sensor the same as boost sensor??
    No, different beast.

    Quote Originally Posted by winnie2457 View Post
    also once the egr valve opens i thought this was only at low revs before the turbo kicks is
    The EGR valve only opens on part load throttle. On full load it is shut and we think on idle it is shut also. We had a very long discussion about this in a thread some months ago and none of us were 100% sure when the EGR actually opens.

    Quote Originally Posted by winnie2457 View Post
    as surely the manifold pressure on full boost will over power the flow from the egr????

    or am i wrong??
    No, the exhaust manifold pressure would always be above the induction. Pressures in the cyclinder are very high whereas the boost pressure is under 1bar.

  10. #10
    Regular Member winnie2457's Avatar
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    Default

    where is the map sensor located on the cdti 150 then. so on idle its closed and on full throttle its closed so only open on part load thats good to know whats the smallest diameter hloe you can blank the egr off with without gettin the management light on????

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