So, the (EGR) valve, is an emission control device, which helps maintain, the combustion chamber temperature.
Consequently, in an effort to reduce, the formation of nitrogen oxides (NOx).
Furthermore, the exhaust gas recirculation valve, draws exhaust, by means of intake vacuum, which dilutes, the incoming air/fuel mixture.
Consequently, reducing the temperature in the chambers, bringing the (NOx) within acceptable limits.
In addition, the exhaust gas recirculation (EGR) valve, also reduces the engine’s octane requirements. As a result, lowering the danger of detonation (spark knock).
So, the most common problem, with an exhaust gas recirculation (EGR) valve is; when carbon build up on the valve cause it to stick. In worst cases, the (EGR) valve and the passages, can be completely clogged up. So, symptoms of a valve, that is stuck open, include rough unstable idle and stalling.
If it’s not the (EGR) valve, could it be something else?
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. Consequently, this can include the likes of; faulty spark plugs, spark plug wires, fuel filters, fuel pump regulator or engine sensors.
Increased hydrocarbon emissions, can be a result of:
- A leaking fuel injector.
- Bad injection timing.
- (EGR) Issues.
- Bad cylinder compression.
- A bad oxygen sensor.
- Malfunctioning catalytic converter.
An increase in (NOx) can be a result of:
- A vacuum leak.
- Clogged fuel injector.
- Low fuel pressure.
- A leaking head gasket.
Rough engine idle, can also be a result of, a plugged (EGR), a faulty ignition coil; a vacuum leak or a problem with, the ignition system.
A malfunctioning catalytic converter, may also lead to a high hydrocarbon emission reading. The catalytic converter is designed to burn emissions; so that the car exhaust is less harmful.
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