Egr valve. Options

[monky322]

Hi, Guys! i've been searching in the forums about the EGR valve, because my engine light came on and in autozone, the guy told me that my EGR valve was the the cause. So I live in Florida, so not emissions tests are required by law; my question is about if the EGR valve malfunction would have an impact on the MPG. I read a tread about the EGR valve not having an impact on my miles per gallon. Somebody said here that only the new oxigen sensor and a tune up can improve our MPG. I am asking because my MPG are a little poor right now so i was thinking that my bad EGR valve might have something to do with it.

thanks for your replies.

[fiveS-FTE]

Your MPG will be effected but slightly, in a internal combustion engine you have a few things going on. First you suck in air the two atoms we desire are Oxygen and Nitrogen. When fuel is prayed into the chamber then compressed the spark plug ignites the chemical reaction between Oxygen and the fuel. The fuel consist of Carbon Hydrates, the Carbon and Oxygen combine together to make Carbon Monoxide or Carbon Dioxide ect.. this fusion of atoms creates a large amount of energy in the form of heat. Nitrogen a inert gas then expands at a rapid rate, the nitrogen is what pushes down on the piston.

The valve simply just returns some of the exhaust back into the chamber to use some of the oxygen and nitrogen maybe some fuel, since N/A engines and can't force all the air they want they want into the engine like turbo/super chargers, we have to come up with ways to get the atoms we need.

To answer you question if the exhaust is not going back into the chamber then your are not getting you maximum power of your pistons therefore more fuel needs to be used to get the same power you expect.

[enderswift]

Your MPG will be effected but slightly, in a internal combustion engine you have a few things going on. First you suck in air the two atoms we desire are Oxygen and Nitrogen. When fuel is prayed into the chamber then compressed the spark plug ignites the chemical reaction between Oxygen and the fuel. The fuel consist of Carbon Hydrates, the Carbon and Oxygen combine together to make Carbon Monoxide or Carbon Dioxide ect.. this fusion of atoms creates a large amount of energy in the form of heat. Nitrogen a inert gas then expands at a rapid rate, the nitrogen is what pushes down on the piston.

The valve simply just returns some of the exhaust back into the chamber to use some of the oxygen and nitrogen maybe some fuel, since N/A engines and can't force all the air they want they want into the engine like turbo/super chargers, we have to come up with ways to get the atoms we need.

To answer you question if the exhaust is not going back into the chamber then your are not getting you maximum power of your pistons therefore more fuel needs to be used to get the same power you expect.

Im just finishing up a thermodynamics course, and we spent 3 weeks on combustions. the point of egr is to lower cylinder temperatures and therefore reduce nox emissions. So the impact on mileage will be miniscule. The biggest problem with a faulty egr systems comes with drivability issues. If you're EGR is stuck open then the engine can get choked with exhaust at low speeds and idle