TPS: Throttle Position Sensor

TPS Hesitation

The TPS or throttle position sensor indicates throttle plate angle to the PCM. The PCM uses this along with other sensor information to adjust the air fuel mixture. The TPS contains a potentiometer like the one in the illustration. Note that some TPS sensors are adjusted by loosening two machined screws and rotating the sensor on the throttle body. This sensors signal is used to indicate normal and sudden acceleration. If it is faulty, hesitation or a dead spot can occur.

This question mentions several important sensors and the PCV valve. A faulty EGR or exhaust gas recirculating valve will result in stumble if it remains open at idle. It will also result in ping or knock if the valve remains closed. The oxygen sensor signal is a vital input for fuel trim in closed loop. This sensor senses the amount of oxygen in the exhaust flow. The PCM uses this input to increase fuel pulse width when oxygen levels are high and decrease pulse width when oxygen levels are low. The PCV or positive crankcase ventilation system keeps the engine’s oil clean by venting crankcase blowby gases into the intake manifold for recombustion.