When installing my CFM+ intake elbow it called to remove it and no check engine light came on and know more egr valve problems on my 04. when the butterfly closes hot gases from the exhaust soot goes thru the engine with the butterfly off it can't and i think is see cleaner oil at oil change.
2003 6.0 butterfly valve
i have a 03 6.0 and was wondering if removing the butterfly valve has any benefit and if so does this trigger a check engine light?
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On my 04 it did throw a code but know light you might ask cfm about the 03
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