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+31 13 30 30 000


EGR systems (Exhaust Gas Recirculation / Emission Gas Recirculation) are used since the 70s to reduce the emission of harmful NOx (nitrogen oxide) from both ignition engines (petrol, LPG, ethanol) and auto-ignition engines (diesel).

These systems direct a portion of the exhaust gases into the combustion chamber(s), hereby reducing the oxygen levels. This lowers the combustion temperature, having a beneficial effect on NOx emission, which is primarily formed at high combustion temperatures.

The advantages of a modern EGR system

  • Lower combustion temperature: less NOx
  • Higher pressure in the inlet channel: improved filling of the combustion chamber
  • Engine operating temperature is reached faster and maintained better

Potential disadvantages of EGR application

  • Power loss
  • Contamination of the inlet channel
  • Increase in fuel consumption

Symptoms of a malfunctioning EGR system

  • Engine doesn't run smoothly and holds back
  • Air intake flow significantly reduced
  • Faulty EGR valve: power loss at full load, poor hot start and troubled idling
  • Higher maintenance costs due to (secondary) defects and contamination
  • Clogged and ultimately defect Diesel Particulate Filters (DPF)
  • Problems with the swirl valves (diesel engines)

Commonly applied solutions

  • Cleaning the EGR system
  • Replace parts (Often costly and it can't be guaranteed that the problems won't reoccur)
  • Disable and/or remove the EGR system (Adjust software/engine-electronics, combined with hardware removal as needed)
  • Combination (s) of the above

KCPerformance can troubleshoot EGR-systems for you. This starts with precise diagnostics; We are equipped with the tools to read error-codes from all brands, supplemented by our extensive practical experience.