Why You Should NOT Remove Your EGR Valve!

this is not about emissions. you should not remove your egr and this is why.

what does egr do
what does egr valve do

[Overdrive]

nothing good can come from putting exhaust gases back in your engine

[jualife]

Perfect example of why you shouldn't believe everything you find on the internet.

[fido]

Exhaust gasses have soot, which nicely deposits itself inside the throttle body, causing other problems.

[The_Conspiracy_Analyst]

Well the EGR causes MASSIVE carbon buildup in the engine.  Also, lots of people do the delete when they are running aftermarket FI, so as to take advantage of the extra volume.  

ANyway, if someone told YOU it was good for you to mix a little bit of output from a sewage pipe into your drinking water, would you go for it?  Just a

[oldsstarfire]

Took the intake off my lq4... nastiest carbon buildup I've ever seen. That negates any economy gain you're taking about

[TheTechTestTube]

I blanked off the EGR on my Diesel engine because a) No pumping losses due to Diesels are technically always on 'WOT', as far as air intake is concerned, and b) Diesels makes a tad more soot that can foul up the intake than petrol engine does. That means less particulates can end up in the oil and better overall fuel economy and power delivery.

[michaelrichey]

EGR = soot in the intake manifold. This is how carbon buildup on intake valves, pistons, and the combustion chamber happens. EGR delete is not for fuel economy - it's for engine longevity.

[supabee]

EGR is like eating your sh*t mixed with your food, would you do that? Me not, so i don't want my engine to do that

[robertgantry]

This is absurd.
1) Allowing exhaust gas to enter the manifold DOES reduce manifold vacuum to a degree, but this does NOT cause more air to be sucked into the cylinder, because it still has to get past the throttle PLATE.
2) You NEED manifold vacuum to pull air into the manifold.
3) Exhaust gasses contain particulate matter which help to wear out your engine.
4) If you actuate your EGR at idle, you will notice that the engine stumbles. That is due to decreased performance. The decrease at cruise is not as noticeable simply because a) the engine is producing more power and torque at cruise, and b) because the exhaust/air charge ratio less at higher RPM's, meaning a smaller percentage of exhaust gas per volume of fuel and air.
5) The purpose for the EGR is to decrease combustion temperatures, but does not open under load when the combustion temperatures are higher, thus defeating the purpose of the EGR. If your engine doesn't knock under load with EGR, then it will not knock under load without EGR. Knocks means nox.
Conclusion: I had a 2012 Ram Cummins 6.7L with EGR. I was changing my oil every 1500 miles due to all that friggin CARBON going into my engine via the EGR system. CARBON is bad for your bearings and cylinders. Therefore EGR IS not only useless, but is also BAD for your engine.

[judgestacker]

I understand your reasoning and it makes sense the way you explain it. I do however still disagree that EGR is beneficial long term. Sort term EGR is of great benefit, but then again so is over-cooling or overheating your engine. The biggest problem with EGR is not the burnt gasses it puts back into your engine, it's the dirt. I have used a bore scope on modern non EGR engines with 150, 000K + miles and observed no carbon build up in the combustion chamber.

The major benefits of deleting EGR are: Less soot and dirt build up in the engine, less electricity being used to regulate this valve, and (if equip) better cooling due to dedicated cooling passages no longer cooling the exhaust gasses. So the only up side to EGR is the increased fuel economy.

So how to correct this loss of fuel economy? use a small cone filter to bypass the normal intake for the PCV system, this will allow for higher air flow into the valve cover, Install an oil catch can with an oil separator near the engine. Now you have a higher flowing PCV system the "cleans" the air before it goes into the manifold. You retain your Miles per gallon, and you drastically reduce the amount of soot and dirt that are put back into the engine.

[Korbin]

Is not the idle air controller is an additional source of air at low throttle settings. The EGR valve ads carbon particles to the incoming air stream. Coupled with the Positive Crankcase Ventilation system you are injecting an oil mist from the engine oils system and carbon particles from the exhaust system into the engine intake. This does the following: 1) Coats the interior of the intake manifold with nice sticky oil and then sprays a stream of carbon particles over it. If you have a turbo charged engine it will tend to clog of the inter-cooler and shorten the life of the turbo charger. It also reduces engine life because this mixture in going into your combustion chambers. This is an especially big problem on diesels.

[ThethKey]

There's always that one guy out there... This is absurd. The only good effect of an EGR valve is in very cold climates when you need the engine to warm up more quickly and that's the only positive thing I can think of the EGR valve doing. it is strictly designed to put some of your pollutants back inside your engine where they will build up as carbon inside your intake.

[mrgitbag]

This is like you recycling your own farts, and you are trying to tell us this is a good thing, I would like to see how long before you get sick... :D

[jumanjii]

Those EGR valves are nothing but trouble. Why would anyone pipe hot dirty sooty exhaust into the intake manifold! You're just looking for trouble. It's a miracle the engine doesn't blow up. You always want a clean fuel air mixture introduced into the engine. When at idle my EGR valve was leaking by and passing hot exhaust into the intake manifold and causing explosions or backfiring out the carburetor. I just eliminated the EGR valve, removed it and installed a blank off plate. Problem solved, no more backfiring.

[thecaptain]

The purpose of an air filter on a car is to ensure that the air from the atmosphere is "filtered" to ensure the air entering the engine is clean and no debris can enter the engine. The exhaust gas recirculation (EGR VALVE) diverts the sooty exhaust gas back into the engine "unfiltered", this is what causes so many problems.

[DieselWeazel]

Good question. Can Seafoam kill an EGR valve?

[samanthatighe]

They are not removing the EGR valves they are showing the people how to replace the EGR valve because they go bad and people need to know how to replace them because they do go bad. The videos have been extremely helpful to me so that I know how to replace my BAD EGR valve.

[limabravo]

If you’re going to remove the egr then you have to tune the computer to coincide with that modification. If someone just blocks it off then ecu is looking for a richer mix at light load and when it doesn’t see it you’ll first get detonation then the ecu will pull timing which decreases power and fuel economy.

[Audimanaha]

gasoline engines* last time I checked my Diesel doesn't have any vacuum in the intake manifold.

[pfoxhound]

when you look to the gas map of every ecu, you will notice that egr is opened not only during high rpms but also near stalls situation.