December 15, 2019

What is EGR Delete?

What Is EGR Delete?

This is a question I get asked all of the time here at Lead Foot Diesel Performance. So I figured it’s time to explain what an EGR delete is and why so many customers are asking about it.

First of all I will cover what exactly the EGR is, EGR stands for Exhaust Gas Recirculation. What the engine manufacturer’s attempted to accomplish here was lowering the NOX emissions being expelled out of the exhaust. co2The way EGR does this is by allowing exhaust gas (which is lower in oxygen) into the intake of the engine it lowers the combustion temperature. This results in a lower NOX emissions, the downside….

cloggedegrThis also results in a clogged up intake system. These spent exhaust gasses are full of soot that would normally exit the exhaust pipe and fall to the ground. This soot is full of carbon (C02) plants use C02 as food. So while C02 in excess can be a bad thing, a little bit can actually be a good thing. Soot build up in your diesel’s intake system is never a good thing. It will reduce engine power and cause excessive wear and tear on the engine due to the higher temperatures that EGR equipped engines run at compared to diesel engines with no EGR.

LBZINTAt the end of the day, the over reaching EPA (Environmental Protection Agency) has made it really hard for us as a shop to really FIX all the engine problems and catastrophic failures associated with the introduction of EGR. EGR has proven to destroy turbos, increase cylinder pressure causing head gasket failures, piston failure, piston to valve contact, the list of engine failures associated with EGR is a mile long. We aren’t allowed to FIX these issues because the Federal Government thinks it’s better to clog your engine up with soot rather than let that soot feed some plants. I guess they think it’s better to clog the engine up to the point major bottom end failure takes place and the rods punch through the side of the block, resulting in engine oil blowing all over the road and ending up in our drinking water. But hey! At least they cut down on NOX emissions a little. All we can do at this point is keep replacing failed EGR coolers, and fixing all the major issues caused by EGR.

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  1. Avatar

    I am fortunate to own a vehicle that pre-dates all these new emission mandates, however a new farm truck is on the horizon and I will be outfitting it with a Sinister kit! Thanks for such a sweet and simple explanation!!

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    Team Sinister,

    I’m from Australia, there are many modern CRD Ddiesel in use here. Mine is a Nissan ZD30 engine. Do you work on this engine? I suspect a simple electronic/electrical feedback loop off the EGR Volume Control Valve assembly may fool the ECU into thinking the EGR is still attached and functioning as directed. What do you think?

    PS If this solution could be found, I would remove all the EGR components and simply block off the holes left in the exhaust and inlet manifolds and rejoin the coolant hoses.



  3. Avatar

    The heading says “What is EGR Delete?”
    But the article just tells what EGR is, and ends by saying “All we can do at this point is keep replacing failed EGR coolers, and fixing all the major issues caused by EGR.”
    I don’t see where the article said what EGR delete is.

  4. Avatar
    Amanda Drew

    Thanks for pointing out that EGR stands for Exhaust Gas Recirculation. It seems like would be something that you’d want to get checked and make sure you don’t have it. You’d just need to find someone who can help you with your EGR delete.

    1. Avatar

      I guess it’s one of those self explanatory type of things. And for legal reasons they cannot legally publish how to mess with emission controls in public sites.


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