On older cars operated by engine vacuum, the EGR valve diaphragm can deteriorate and leak, causing a rough idle and a check engine light. In that case, the valve should be replaced. If your car is running fine at idle and you don't have a check engine light, there's no need to replace or clean an EGR valve. Can you drive with a bad EGR valve? What code will a bad EGR valve throw? Does removing EGR increase power? What happens if EGR valve is blocked?
Is there an additive to clean EGR valve? How much is a new EGR valve? How hard is it to change an EGR valve? Does EGR damage engine? How important is a EGR valve? Do you need the EGR valve? What causes a EGR valve to go bad?
Will a car run without an EGR valve? Where is the EGR valve located? What are the symptoms of a bad EGR pressure sensor? Forgot your password? Get help. Industry Today. Imply Introduces Project Shapeshift. Important Points of Protection in a Building. Achieve Digital Excellence with Customized Solutions.
Home Articles Automotive. An understanding of the functions of an EGR Valve. Before you start cleaning, make sure you place your car on a flat and even surface. Switch off the car engine, as well. Find the EGR valve. There are three types that vary according to the make and model of your vehicle: vacuum-controlled unit, electronic vacuum-controlled valve, and electronic-controlled digital valves.
Check the manual for your vehicle so you can determine the type of EGR valve on your vehicle and to determine its precise location. Remove the valve and make sure to remove any other parts that are in the way. Unplug electrical connectors that might be attached to the valve.
The exhaust gas recirculation EGR valve reduces the combustion temperature in vehicles, which helps reduce the amount of nitrous oxide emitted from the exhaust system.
The EGR valve was first added to automobile engines in to help recuce smog production. EGR valves rarely require maintenance or repair and they also rarely need to be replaced. Increased fuel consumption is caused when the valve is constantly open. This is because the temperature is lower so fuel does not burn at the optimal temperature and as a result is less efficient.
Stalling when the engine idles like a rough idle is usually caused when the EGR valve is permanently open and is constantly letting exhaust gases into the EGR system. You can usually smell fuel if there is a continuous flow of exhaust gases into the intake manifold, because at low revs not all the fuel burns. 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. However, it is worth noting that usually the EGR valve starts to degrade before it fails completely and the engine management system may not pick up on it until it actually fails. Therefore it is worthwhile looking out for the other signs and symptoms mentioned.
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.
While if your valve is always closed the high temperatures in the combustion chamber allows excessive formation of NOx gases. Knocking noises from the engine can be caused if the EGR is constantly closed. This is because at low rpm the fuel ignites early when it meets the high temperature. Detonations are also common as a second ignition can occur after the normal ignition.
Some of the same engine performance problems which are indicative of an EGR valve failure can also indicate problems in other parts of the system. This can include the likes of faulty spark plugs, spark plug wires, fuel filters, fuel pump regulator or engine sensors.
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