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I was told by AZ that it mostly had to do with the EGR as that is how most of the nitrogen oxide gets reduced by lowering the combustion temperatures. If it isn't working properly it won't open and allow the flow of exhaust back into the engine yada yada yada, all of which I'm sure you are familiar.
Is it hard to remove the plenum and if I do, can I then easily get to the egr ports and clean them if that is as far as I remove things?
Is there any good websites for the do it yourselfer?
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