Exhaust Gas Recirculation (EGR) 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 of an EGR Valve
- Check Engine Light may come on
- Vehicle may fail emissions tests
- Rough idle
- Engine "pinging" on acceleration
Related Repair Advice of an EGR Valve
- 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