WHAT DOES A EGR VALVE DO
Postmaster
Joined: Apr 2006
Posts: 3,524
Likes: 2
From: CA Bay Area
I'm no expert 
but it's my understanding that NOx does little damage and is broken down quite quickly in the air with sunlight. But good luck getting the nitrogen out of the air 
I'll store it for you in my tires.
Yup SOx is a bad one, but that has been largley solved by getting the sulpher out of the fuel.
yeahhh no more acid rain!
but it's my understanding that NOx does little damage and is broken down quite quickly in the air with sunlight. But good luck getting the nitrogen out of the air I'll store it for you in my tires.Yup SOx is a bad one, but that has been largley solved by getting the sulpher out of the fuel.
yeahhh no more acid rain!SOMEBODY "tips" the environmental groups to tell us that particles from diesels are more harmful, than poisons coming form gassers.
Similar with "cleaner" gasoline sold in California. Per my experience I have to burn 15% more the stuff sold at CA pumps, than gasoline bought in different states. Never could find official data that 1.15 gallons of CA gasoline produce less pollution than 1 gallon of gasoline from different state.
Than talking abut EGR. It was just a simple recirculating valve on older engines. Newer engines, with computerized control that goes as far as cutting off fuel while coasting downhill can take gas recirculating into engine management data.
Meaning if you have advanced engine and cut off one link in the management >>> you might get more surprises than you wish for.
Fleet Owner
Joined: Mar 2003
Posts: 24,724
Likes: 74
From: Blue Hill Township
Cause that's it's purpose, well not directly but close. It's purpose is to reduce NOx emissions, no real reason why. NOx are produced during high heat combustion, the EGR cools cumbustion temps.
I'll play both myself and the EPA;
Me - But wait isn't an engine a heat pump that must burn fuel effeciently to run effecently?
EPA - Well yes.
Me - And wouldn't that combustion and it's effects on the heat pump of an engine be more effecient if it was hotter?
EPA - Well yes.
Me - So by cooling the cumbustion with an EGR we are making the engine less effecient reducing mileage and power?
EPA - Yup, SHHHHH don't tell.
Me - Ohh and also aren't we using energy to pump the same gasses that go through the EGR twice?
EPA - Hey I told you to shut up!
Me - Wouldn't we all be better off even if we agree that reducing NOx is a good thing if we just use less fuel by making the engine more effeciant instead?
EPA - SHUT UP! SHUT UP! SHUT UP! Or I'll have you arrested.
Me - And isn't it true that the only real dangerous emission that engines expel is CO (Carbon Monoxoide) and wouldn't CO emissions be reduced by burning the fuel hotter and more completely, thus reducing a truely bad emission that actually does harm?
EPA - OK that's it, ARREST HIM!!
I'll play both myself and the EPA;
Me - But wait isn't an engine a heat pump that must burn fuel effeciently to run effecently?
EPA - Well yes.
Me - And wouldn't that combustion and it's effects on the heat pump of an engine be more effecient if it was hotter?
EPA - Well yes.
Me - So by cooling the cumbustion with an EGR we are making the engine less effecient reducing mileage and power?
EPA - Yup, SHHHHH don't tell.
Me - Ohh and also aren't we using energy to pump the same gasses that go through the EGR twice?
EPA - Hey I told you to shut up!
Me - Wouldn't we all be better off even if we agree that reducing NOx is a good thing if we just use less fuel by making the engine more effeciant instead?
EPA - SHUT UP! SHUT UP! SHUT UP! Or I'll have you arrested.
Me - And isn't it true that the only real dangerous emission that engines expel is CO (Carbon Monoxoide) and wouldn't CO emissions be reduced by burning the fuel hotter and more completely, thus reducing a truely bad emission that actually does harm?
EPA - OK that's it, ARREST HIM!!
EGR on a diesel is a different story.
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New User
Joined: Jan 2011
Posts: 21
Likes: 0
if your engine has an egr valve and the valve was hanging up a bit it can cause a rough idle. if the valve was not working it usually results in the engine pinging, however most, if not all vehicles these days have knock sensors that will kick back the timing if the engine starts to knock or ping, and usually the pcm will advance the timing to where the engine just begins to knock then back off the timing for best economy/performance.
if your engine is way down on power id probably look elsware, cat converter restricted, plugged fuel filter, etc. a lot of things can cause a loss of power
if your engine is way down on power id probably look elsware, cat converter restricted, plugged fuel filter, etc. a lot of things can cause a loss of power
Laughing Gas
Joined: May 2009
Posts: 908
Likes: 2
From: Covina, CA.
Cause that's it's purpose, well not directly but close. It's purpose is to reduce NOx emissions, no real reason why. NOx are produced during high heat combustion, the EGR cools cumbustion temps.
I'll play both myself and the EPA;
Me - But wait isn't an engine a heat pump that must burn fuel effeciently to run effecently?
EPA - Well yes.
Me - And wouldn't that combustion and it's effects on the heat pump of an engine be more effecient if it was hotter?
EPA - Well yes.
Me - So by cooling the cumbustion with an EGR we are making the engine less effecient reducing mileage and power?
EPA - Yup, SHHHHH don't tell.
Me - Ohh and also aren't we using energy to pump the same gasses that go through the EGR twice?
EPA - Hey I told you to shut up!
Me - Wouldn't we all be better off even if we agree that reducing NOx is a good thing if we just use less fuel by making the engine more effeciant instead?
EPA - SHUT UP! SHUT UP! SHUT UP! Or I'll have you arrested.
Me - And isn't it true that the only real dangerous emission that engines expel is CO (Carbon Monoxoide) and wouldn't CO emissions be reduced by burning the fuel hotter and more completely, thus reducing a truely bad emission that actually does harm?
EPA - OK that's it, ARREST HIM!!
I'll play both myself and the EPA;
Me - But wait isn't an engine a heat pump that must burn fuel effeciently to run effecently?
EPA - Well yes.
Me - And wouldn't that combustion and it's effects on the heat pump of an engine be more effecient if it was hotter?
EPA - Well yes.
Me - So by cooling the cumbustion with an EGR we are making the engine less effecient reducing mileage and power?
EPA - Yup, SHHHHH don't tell.
Me - Ohh and also aren't we using energy to pump the same gasses that go through the EGR twice?
EPA - Hey I told you to shut up!
Me - Wouldn't we all be better off even if we agree that reducing NOx is a good thing if we just use less fuel by making the engine more effeciant instead?
EPA - SHUT UP! SHUT UP! SHUT UP! Or I'll have you arrested.
Me - And isn't it true that the only real dangerous emission that engines expel is CO (Carbon Monoxoide) and wouldn't CO emissions be reduced by burning the fuel hotter and more completely, thus reducing a truely bad emission that actually does harm?
EPA - OK that's it, ARREST HIM!!
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