Most modern vehicles are equipped with computer systems that help them detect when there are problems with their operations. However, computers and their components occasionally malfunction. A throttle position sensor tells the computer what position the throttle is in. This information is important because it affects the timing of the spark plugs, the transmission gears and the amount of fuel
. flow. When the throttle position sensor does not work properly, it affects numerous aspects of the engine and results in lower fuel efficiency.A few main symptoms that indicate a bad throttle position sensor include stalling, slow acceleration, abrupt changes in the speed of the car and jerking or bucking of the vehicle. The driver might also notice poor gas mileage, trouble changing gears and the illumination of the engine indicator light on the dashboard. In some cases, the throttle position sensor has a loose wire or a dead spot. In other instances, its initial setting is inaccurate, and it needs only a miniscule adjustment to work correctly. On the other hand, it might require a replacement.If the driver suspects that the throttle position sensor is bad, there are ways to troubleshoot it. The owner can attach a multimeter to the sensor and then manually open the throttle. The sensor has three terminals, so the problem might affect any one of them. By checking the multimeter while testing the voltage of the terminals, the driver can usually determine whether the throttle position sensor is faulty.Replacing a bad throttle position sensor is a relatively easy process. The mechanic removes the old sensor and inserts the replacement piece into the throttle chamber. The sensor harnesses are connected, and the bolts are tightened. The vehicle is then ready for operation. To ensure that the new throttle position sensor is working properly, the driver can test by using the multimeter. More reference links: http://www.1aauto.com/1A/ThrottlePositionSensor http://www.buzzle.com/articles/symptoms-of-a-bad-throttle-position-sensor.html
