Maybe I'll whack it up as a new thread, and post the associated codes, and quote sources as well. I was super confused by all of this when I first started trying to figure out my EGR issues, and it took a lot of reading before I thought I understood what was going on. There's tons of conjecture being passed around as facts, not just here, but on loads of other auto-related message boards. There's people who want to tell you to just block it off permanently, but all you're doing in that case (other than breaking the law) is decreasing your fuel efficiency and causing unnecessary pinging/knocking because your ignition is happening too soon in the stroke. The EGR system isn't there because hippies want to make your engine less powerful, it's there because the oxygen mix in the piston is an important factor for proper function of the engine.
http://www.newton.dep.anl.gov/askasc...9/eng99611.htm
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