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I think EGR has a huge play in lean burn as well. I believe that under lean burn, the introduction of exhaust gas brings down the oxygen content in the mixture. This does 3 things, 1. Makes the mixture less volatile, 2. Allows greater resistance to detonation, 3. Allows more timing to be applied to compensate for the slow burning of the mixture. I believe this is also the reason that, when an EGR is failing on an insight, lean burn (as well as timing in lean burn) will randomly drop out.
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