When do you Know Your EGR is not working?
This fact makes it hard to stay on top of the EGR system as drivers rarely notice that it is not working until they fail an emissions test. But one more thing.
Can a blocked EGR cause excessive NOx?
You will find a lot of info. My mech is an emissions guy and he says a blocked or malfunctioning egr will cause or contribute to excessive Nox, which is why i failed the 2nd time. Keep in mind, the repairs i made brought the readings down a lot, and although i failed Nox again, i did pass on hydrocarbons which i failed the first time.
Do you need to clean out the EGR pipe?
Htown, You don’t need to remove the intake to clean out the EGR crossover pipe, it can be done in the car. Removing the intake is quite a job and unless you just want to do it, cleaning the EGR pipe can be done in very little time if done correctly.
Why does my EGR go away when I clear the crossover pipe?
Once I cleared the crossover pipe the detonation went away as did the vast majority of the NOx. The theory of EGR is interesting in that it’s only purpose is to introduce a little bit of inert, already burned gas back into the combustion chanber to lower the combustion temperatures thus lowering oxides of nitrogen (NOx).
What happens when an EGR valve is not working?
When your EGR valve isn’t working correctly more emissions will be emitted. As aforementioned if the valve is stuck open the temperature is lowered which prevents all the fuel from burning. This means an increased flow of unburned hydrocarbon gases coming out of the tailpipe.
Why does the fuel management light stay on when the EGR is open?
This means the amount of hydrocarbon gases emitted from the tailpipe increases significantly producing a fuel smell. Your engine management light may stay on once your car detects an issue with the EGR valve. This could be caused when the EGR is either constantly closed or open.
What are the different types of EGR valves?
This helps to ensure the car maintains fuel efficiency and emits fewer emissions. There are two types of EGR valves; a vacuum-operated and an electronically controlled EGR valve. A vacuum-operated EGR valve is usually only found in older vehicles. It is a straightforward system which utilises a vacuum to switch the EGR valve from closed to open.
How does EGR reduce the production of NOx?
To reduce the amount of NOx pollutant emitted from your vehicle, exhaust gases need to be cooled before being emitted from your vehicle. In order to achieve this, they are introduced back into the combustion chamber via the exhaust gas recirculation (EGR) valve; this reduces the temperature and thereby inhibits the production of NOx emissions.