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Thread: EGR blanked with 9mm hole Why does the car still run smoother if I unplug the EGR valve

  1. #1
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    Default EGR blanked with 9mm hole Why does the car still run smoother if I unplug the EGR valve

    Hi all

    I used one of these http://www.ebay.co.uk/itm/EGR-blanki...#ht_684wt_1139

    thinking I didnt want the light on however it sometimes still comes on sometimes. So I started to notice the car a bit rough on cold start. Unplugged EGR makes it smooth again

    Im thinking of blanking completely I can live with engine light on

    My theory is the EGR must be nearly closed when I unplug it allowing car to run better?

    Has anyone just ran the car with egr unplugged? Are there any disadvantages of this?

  2. #2
    Regular Member Dan_BlackSRi's Avatar
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    Vehicle : Vectra SRi

    Trim : XP NAV

    Engine : 1.9 CDTi 150

    Year : 2007

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    With the EGR unplugged it won't function, i.e. it will stay closed which is why your car runs better with it like that.

    With that gasket, your EGR runs pretty much as it would normally, hence the uneven running.

    This says your EGR valves is closing properly, but is probably sticking in its operation.

    There are numerous threads on this subject though, believe me

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    UPDATE: I completely blanked off my egr over the weekend and its made quite a bit of difference over the partial blank with the 9mm hole. Idle is smoother and engine revs easier so my egr valve must be stuck open. I think I'll leave it like this the EML light is on but I'll get used to it.

    I read up a bit on the internet and read an article saying having an egr valve helps the turbo stay cooler? Sounds strange to use the hot exhaust gas to cool the turbo. Surely the cooler air is from the intake. The article I read says turbo problems can occur if EGR valve stays closed. Is it just me or am I missing something?

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    Regular Member Dan_BlackSRi's Avatar
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    Vehicle : Vectra SRi

    Trim : XP NAV

    Engine : 1.9 CDTi 150

    Year : 2007

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    Its all about the mixture of the gases that reduce combustion temps (in a nutshell).

    On the VX CDTi there hasn't been any reports of component failure due to the blanking of EGR valves - it all depends on the manufacturer, Renault (on the other hand) have many issues with EGR's that lead to turbo failures.

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    Regular Member felixx's Avatar
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    Quote Originally Posted by Dan_BlackSRi View Post
    Its all about the mixture of the gases that reduce combustion temps (in a nutshell).

    On the VX CDTi there hasn't been any reports of component failure due to the blanking of EGR valves - it all depends on the manufacturer, Renault (on the other hand) have many issues with EGR's that lead to turbo failures.
    The turbo is oil cooled and has its own dedicated supply to cool it anyway.If you make sure your oil is the right type and changed on a regular basis there should'nt be a problem. FELIXX.

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    Regular Member lee gsi's Avatar
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    Vehicle : Signum

    Trim : Design

    Engine : 1.9 CDTi

    Year : 2005

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    Quote Originally Posted by felixx View Post
    The turbo is oil cooled and has its own dedicated supply to cool it anyway.If you make sure your oil is the right type and changed on a regular basis there should'nt be a problem. FELIXX.
    Its nothing to do with the oil.

    The egr gases are added to the mixture when below 2500 rpm so it keeps the correct mixture ratio (Stoichiometric value) giving improved power and better emissions.

    http://en.wikipedia.org/wiki/Exhaust_gas_recirculation

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    Regular Member Dan_BlackSRi's Avatar
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    Vehicle : Vectra SRi

    Trim : XP NAV

    Engine : 1.9 CDTi 150

    Year : 2007

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    Quote Originally Posted by lee gsi View Post
    Its nothing to do with the oil.

    The egr gases are added to the mixture when below 2500 rpm so it keeps the correct mixture ratio (Stoichiometric value) giving improved power and better emissions.

    http://en.wikipedia.org/wiki/Exhaust_gas_recirculation
    Improved power over what? No EGR? If so then its bull

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    Regular Member 19DTH's Avatar
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    No improved power with EGR. It is to do with reducing combustion chamber temps. Diesel engines run for the most part with excess air. With a diesel it takes in the same amount of air on every intake stroke, speed being controlled by the quantity of fuel injected. A full charge of air is required to generate the heat to ignite the diesel fuel. If some of the intake charge is replaced with an inert gas then you still have the full cylinder to generate the heat during compression stroke allowing the fuel to self ignite. NOx is formed when nitrogen and oxygen are sbjected to high temps and EGR helps to reduce the the formation of NOx. The use of the latest piezo injectors help reduce emissions further by injecting upto 6 times per cycle. Never known a turbo fail due to no EGR.

  9. #9
    Regular Member lee gsi's Avatar
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    Vehicle : Signum

    Trim : Design

    Engine : 1.9 CDTi

    Year : 2005

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    Diesels don't work the same way as Petrol cars.

    Petrol cars alter the amount of air (Via the throttle body valve) but diesels cant do that. Diesel cars will suck air and there is nothing to regulate it.

    To get the correct mixture it needs to inject 'something' that will take up oxygen space that doesn't burn so the correct mixture is created.

    The something is EGR gas.


    Its not speculation its fact. Have a read or speak to a technician that knows what they are talking about.

  10. #10
    Regular Member TonyP2020's Avatar
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    Vehicle : Meriva B

    Trim : SE

    Engine : 1.7CDTi

    Year : 2011

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    By feeding the lower oxygen exhaust gas into the intake, diesel EGR systems lower combustion temperature, reducing emissions of nitrous oxides.
    This makes combustion less efficient, compromising economy and power.

    Diesel EGR also increases soot production, though this was mitigated in the US by the simultaneous introduction of diesel particulate filters.

    EGR systems can also add abrasive contaminants and increase engine oil acidity, which in turn can reduce engine longevity.
    The full quote, about Diesel Engines, from Wikipedia above.

    Maybe we have to choose what is more important overall:
    fuel economy, NOx emisions, CO2 emissions, soot emisions or engine/car life.
    The polititions have chosen for us up till now, based on the current scienctific ideas. Which will change again.

    My view is that the EGR on my 2.0Dti, without DPF, is good on a new engine, but as the engine ages the amount of sooting up of the inlet manifold that takes place makes the fuel ecomony, soot emissions and performance even worse. My EGR is mostly blanked, and I think this is the best for my car at it's age and mileage (77K).

    On later engines (1.9CDTi, etc.) the inlet manifold and DPF still soot up so maybe the EGR on a high mileage engine should also be partially blocked to preserve engine/car life and keep the car economic.

    After all, how much NOx/CO2 does making a new car release into the atmosphere and how much energy does it use??
    Last edited by TonyP2020; 8th August 2011 at 23:51.

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