The Ram 1500 Air Duct channels fresh, filtered air to the engine for strong ignition while protecting underhood components. Positioned immediately at the rear of the air filter box, the Air Duct seals against the entry of dust, sand, leaves, and other debris which, if not restricted, could score pistons, rings, and cylinder walls and put an unnecessary strain on the oil filter. The mass air flow sensor in the Ram engine measures the amount of incoming air in the same channel. The Air Duct prevents unmetered air from getting past the sensor, thus ensuring the fuel injectors get accurate data for the proper mixture. In the event of a crack in the Air Duct, unfiltered air slips in, the mixture turns lean, and costly wear follows quickly. Prior Ram 1500 vehicles feature a simple molded tube. More recent Ram 1500 designs fuse the tube with tighter joints around the sensor area. However, in every case, the Air Duct maintains total integrity between the filter box and throttle body. If owners of this important part keep it intact, the performance and life of the engine will be protected, allowing any 1500 to stay reliable.
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