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Old 02-17-2012, 06:28 PM
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whunter whunter is offline
Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,357

Originally Posted by 1fastredsc View Post
EGR's are also meant to help reduce NOx, HC, and CO emissions, by recycling the exhaust gases for another go through. It forces the NOx to separate back into N2 and O2, which allows the O2 to finish reacting with the HC and CO to create CO2. So removing the EGR will get rid of the gunk in the intact manifold, increase part load power, clean up the engine bay, and possibly increase fuel economy, but will also increase emissions.
On the older OM61x and OM60x engines, removing the EGR has minimal or no detectable effect on emissions.

It was installed to make CARB and the EPA think they where concerned about emissions.

If the engine is in good condition it will pass the required testing without any EGR.

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