Reducing Emissions - Croce\'s Transmission

Reducing Emissions

(EGR) System: Purpose

The exhaust-gas-recirculation (EGR) system reduces harmful NOx emissions that contribute to air pollutions by recirculating exhaust gas back through the intake manifold into the engine.

There, it acts as a cooling agent to lower combustion temperatures.

All this is done with the intention of preventing mono-nitrogen oxides (NO and NO2) from forming in the engine and being expelled through the tailpipe into the atmosphere.


  • One indication that car owners have that the EGR systems on their vehicles are malfunctioning is that it will give rise to detonation (also known as spark knock and ping), particularly when the engine is cold.
  • Other symptoms of a malfunctioning ERG are hesitation or stalling on acceleration and stalling on deceleration and during quick stops.

TIP: If an EGR valve becomes clogged with carbon deposits, the "Check Engine" light will likely come on and a code will show insufficient flow.

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Written by Maryann Croce