mcjk. i get rattle at idle when engine cold (with egr disconnected) can you give me a clue there as to why? also are you saying that without the egr valve operating the maf sensor helps compensate for the lack of gas flow or is it simply compensated for by the map sensor calling for a bit more boost and getting the airflow valve opened a bit more? if you block the egr and the airflow valve doesn't open more you choke the engine and lose power, not increase it as is happening. also my engine idle revs don't change, still steady at 800. but much stronger at idle. if the air flow valve is an issue with the egr blocked, is that problem solved by removing the airflow valve or are there other issues as well?
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