So, if you're curious about how the EGR valve works in your diesel engine, stick around. As a former professional mechanic and lifelong gearhead, I'll break it down for you.

Diesel engine Tier 4 Final solutions will include SCR, EGR. DPF and DOC.

Ford Motor announced Wednesday at the 2010 SAE World Congress that it's incorporating cooled EGR (exhaust gas recirculation) into its EcoBoost repertoire of gas engines.

So, if you're curious about how the EGR valve works in your diesel engine, stick around. As a former professional mechanic and lifelong gearhead, I'll break it down for you.