Car encyclopedia

Exhaust Gas Recirculation Valve

The exhaust gas recirculation valve (EGR valve) recirculates a portion of the exhaust gas back into the combustion chamber, which helps your vehicle produce fewer oxides of nitrogen, a major pollutant.

Symptoms of Wear or Failure

  • Check Engine Light may come on
  • Vehicle may fail emissions tests
  • Rough idle
  • Engine "pinging" on acceleration

Related Repair Advice

  • The entire EGR system should be inspected and cleaned (if necessary) when an EGR valve is replaced
  • The EGR valve can be operated by engine vacuum or an electric solenoid(s)
  • High oxides of nitrogen (HOx) are a result of high temperature and/or pressure in the combustion chamber. Allowing exhaust gases into the combustion chamber lowers the combustion temperature.
  • On certain engines, the EGR valve could potentially be installed backward, resulting in illumination of the Check Engine Light and a rough idle condition

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