The Acura MDX Air Duct directs the flow of clean, metered air to the engine to provide protection for performance and longevity. In modern Acura models, which are situated after the air filter box, this Air Duct keeps a covered path so the air filter can absorb dust, sand, and debris that would otherwise grind away pistons, rings, and valves. By sealing out leakage before the mass air flow sensor, the Air Duct provides accurate data on the air flow to the computer so the injectors can get the right fuel mixture and the car does not go to lean conditions that burn internal parts. Early generations of MDX were built with a simple plastic Air Duct molded in one piece and later with a multi-section design with flexible joints to absorb the movement of the engine without cracking. This change has lessened the risk of unfiltered air sneaking through aged rubber connections. No matter what style, every Air Duct should be able to stand up to the enormous amount of air flow one engine draws, roughly 10,000 gallons per gallon of fuel. Any crack or loose clamp is an invitation for contaminants to overload the oil filter and increase engine wear. This emphasis on air-tight integrity is the reason for Acura specifying periodic inspection of the Air Duct during routine service on the MDX.
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