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Thread: Still got EML on help please

  1. #1
    Regular Member vectra 120's Avatar
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    Default Still got EML on help please

    Right had this EML on for some time cleaned the following

    1 EGR
    2 Boost sensor

    had a OP-COM readout on the following

    Injection Quantity Deviation ( are they the glow plugs ?)

    No1 -0.82
    No2 -1.02
    No3 0.99
    No4 0.58

    Would the above cause the EML to come on also still have the P0400-5A error on

    Thanks

    Steve

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    Vehicle : CDTI 150

    Trim : Design

    Engine : Z19DTH

    Year : 2005

    Default

    The glow plugs will have nothing to do with inj quantity deviation. The deviation is purely to do with the injectors and compensates for variences during the manufacture of the injector.
    Each injector has a code on its top that needs to be programmed in to the ECU if a new/replacement injector is fitted, this 'tells' the ECU what deviations (differences) this injector has.
    Could be a worn/slightly blocked injector with No 2 being favourite.
    Try some fuel system treatment such as Forte in the first instance.

    With respect to the P0400-5A code did you clean the area where the EGR pipe connects to the inlet manifold ? The 05A bit relates to low flow, basically the ECU monitors 'total flow' through the inlet manifold using the boost (MAP) sensor.
    'Total flow' is made up of clean air as monitored by the AMM (MAF) plus exhaust gases that enter through the EGR.
    When the EGR is open the ECU reduces clean air by closing the butterfly valve in the throttle body. If the total flow monitored is low then the ECU suspects that flow from the EGR is reduced.
    Could be you need a new EGR, sometimes cleaning does not work or the path of exhaust gasses is restricted.

    Hope this helps

  3. #3
    Regular Member vectra 120's Avatar
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    Default

    Quote Originally Posted by lesj View Post
    The glow plugs will have nothing to do with inj quantity deviation. The deviation is purely to do with the injectors and compensates for variences during the manufacture of the injector.
    Each injector has a code on its top that needs to be programmed in to the ECU if a new/replacement injector is fitted, this 'tells' the ECU what deviations (differences) this injector has.
    Could be a worn/slightly blocked injector with No 2 being favourite.
    Try some fuel system treatment such as Forte in the first instance.

    With respect to the P0400-5A code did you clean the area where the EGR pipe connects to the inlet manifold ? The 05A bit relates to low flow, basically the ECU monitors 'total flow' through the inlet manifold using the boost (MAP) sensor.
    'Total flow' is made up of clean air as monitored by the AMM (MAF) plus exhaust gases that enter through the EGR.
    When the EGR is open the ECU reduces clean air by closing the butterfly valve in the throttle body. If the total flow monitored is low then the ECU suspects that flow from the EGR is reduced.
    Could be you need a new EGR, sometimes cleaning does not work or the path of exhaust gasses is restricted.

    Hope this helps
    Thanks m8

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    Regular Member felixx's Avatar
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    Quote Originally Posted by vectra 120 View Post
    Thanks m8
    Just a slight "hijack" question,if the ECU detects a lack of EGR gasses,(ie,when it has been blanked),will it compensate by letting more air in to equal out the volume that is required,thus using the same amount of fuel?.FELIXX.

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    Vehicle : CDTI 150

    Trim : Design

    Engine : Z19DTH

    Year : 2005

    Default

    In a word yes.
    This is why a diesel will still work if the butterfly is removed, diesels don't use the butterfly to maintain air/fuel mixture in the same way as petrols.

    I dont want to get to much in the weeds as I dont profess to be an expert.
    Diesels differtiate from petrol engines in the way the air/fuel mixture is used.

    Petrols strive for 14.7/1 (stoichiometric) as an ideal. When accelerating the injector gives more fuel and the butterfly allows more air, when cruising burns lean i.e. less fuel for same volume of air.

    Diesels basically chuck in more diesel to increase torque, which is basically how the plug in tuning boxes work.

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