(EGR) Valve - Is The Problem Your (EGR) Valve Or Is It Something Else
(EGR) Valve – Is The Problem Your (EGR) Valve Or Is It Something Else

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(EGR) Valve – Exhaust Gas Recirculation Valve – What Should You Know

Exhaust Gas Recirculation (EGR) Valve – Types – Failure – Replacement


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; 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. 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.

Conclusion

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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