Why Does Cleaning The EGR Help MPG ?

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Why Does Cleaning The EGR Help MPG ?

Diesel Engines A forum dedicated to diesel engines fitted to Volvo cars. See the first post in this forum for a list of the diesel engines.

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Jan 12th, 2009, 14:48	#1
200bhp XC90 03 D5 Auto Last Online: Feb 29th, 2012 07:27 Join Date: Nov 2008 Location: solihull	Why Does Cleaning The EGR Help MPG ? I have read up and subsequently cleaned the EGR mixer on my D5 XC90 and according the the computer the mpg has improved. Can anyoine explain what exactly the EGR does (I know it recirc exhaust gas) but why is this benificial ? Presumably it must be if cleaning the mixer allows more EGR ands gives better mpg. Or does cleaning just affect some sensor giving the illusion of better mpg ? Also if EGR is beneficial why do I read of people blanking it off ? Thanks

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