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I have an idea....
MB makes a special tool for holding the airflow sensor plate in a specific position for fuel flow testing. How about you purchase it, attach it on and have it so it holds the throttle open those few millimeters that you need and drive with it for a bit?
Part # 201 589 00 99 00
Does the duty cycle return to a normal reading with the plate deflected
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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k
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