The Throttle Body of the Volkswagen Passat controls the amount of air passing to the cylinders, thus ensuring that the computer can adjust the right amount of fuel to be mixed to provide easy power and clean up the air. Located between the air filter and the intake manifold, it has a butterfly valve that opens when the driver hits the accelerator, whether by a traditional cable, or by electronic throttle control that replaces the linkage with an electric motor and pedal sensors, eliminating lag and making throttle effort interdependent with stability control. The Throttle Body injection assembly of the early generations attached one or two injectors to the plate to improve cold starts, mileage and emissions without replacing most of the original intake hardware like the carburetors, and it appeared cheaper than more modern systems. Subsequent models of Volkswagen utilized independent multi-port injectors to make the air door an air-only unit with an idle air control passage and throttle position sensor to supply constant data to the powertrain control module to make accurate idle and fueling adjustments. Periodic inspection of the Throttle Body on a Volkswagen can help avoid rough idle or stalling due to wear on the shaft and accumulated carbon; however, the wear can be so severe as to require replacement. In the long term, a maintained Passat has the added advantage of airflow metering, which is accomplished by a robust but surprisingly complex set of throttle hardware by Volkswagen.
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