Choose Your (EGR) Valve Help Topic Below
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). Also, The Exhaust Gas Recirculation valve; draws exhaust by means of intake vacuum; which dilutes the incoming air/fuel mixture. As a result, Reducing the temperature; in the chambers; bringing the (NOx) within acceptable limits. Finally, The Exhaust Gas Recirculation valve also reduces the engine’s octane requirements; and lessens the danger of detonation (spark knock).
So, The most common problem with an Exhaust Gas Recirculation valve (EGR); is when carbon build up on the valve cause it to stick. In worst cases; an Exhaust Gas Recirculation valve and the Exhaust Gas Recirculation passages; can be completely clogged up. Finally, symptoms of an Exhaust Gas Recirculation valve; that is stuck open; include rough unstable idle and stalling.
Often a car stalls when stopping after exiting the highway. So, If the Exhaust Gas Recirculation system; is plugged; or the valve is stuck closed; the combustion temperature increases. This may cause pinging (detonation); as well as surging on light acceleration. Consequently, in a diesel engine; a bad Exhaust Gas Recirculation valve; is one of the causes of a black smoke. The Check Engine light might also come on in either case.
Furthermore, keep an eye open for any of the engine codes.
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
- Bad cylinder compression
- A bad oxygen sensor
An increase in (NOx) could be caused by:
- A vacuum leak
- Clogged fuel injector
- Low fuel pressure
- A leaking head gasket
Rough idle can also be a result of a faulty ignition coil; a vacuum leak or a problem with the ignition system.
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