Thethrottle body controls the engine's air supply, and it comes in mechanical and electronic versions. The common warning signs of a bad throttle body are an illuminated check engine light, reduced engine power, rough idling, stalling, and rare cases of misfires and rough running.
Theair intake system is responsible for controlling the amount of air that you are letting into the engine. In order for your engine to run properly, you need the exact right combination of fuel and air. Involved in the operation of the throttle is the throttle position sensor, which is used to determine the position of your vehicle's gas pedal.
First you might experience a hesitation or possible surge when accelerating. Second, your RPMs might display as higher than usual. Third, while strange, you might experience the revving of the engine without the gas pedal being pressed. Fourth, the engine might stall out when coming to a complete stop or in traffic.
Doingthis can help keep your exhaust system clean in addition to your air intake system. Bad Throttle Body Vs. Faulty Throttle Position Sensor. Most modern cars utilize a throttle position sensor (TPS) to determine the position of the throttle. In contrast, older vehicles use a mechanical linkage that connects the gas pedal to the throttle body. ABH2.