The throttle position sensor is located either on the side of the carburetor of your car or the side of the fuel injected models. Normally, this sensor is attached to the throttle body. Just like any other part of the car, throttle position sensor is subject to malfunctioning. Whenever you experience problems with this sensor, visually inspect the sensor for worn insulation on the wires and a loose or cracked connection. And below here are some symptoms of throttle position sensor malfunction
1. Faulty oxygen measurement
When the throttle position sensor in your automobile goes bad, it will not be able to measure the amount of oxygen in the exhaust gas accurately. This can increase the toxicity of the fumes that are expelled from your tailpipe, which almost always results in a failed inspection. In addition to possibly increasing the toxicity of exhaust gas, a faulty sensor can reduce engine power and fuel efficiency. In extreme cases, it may also cause your engine to overheat. Replacing the part generally costs between two and three hundred dollars at your local auto repair shop.
2. Improper fuel metering
Several automotive components work together to ensure that the proper amount of gasoline is being burned at all times. If there is a problem with the throttle position sensor, fuel injection unit, the carburetor, or the engine control unit, metering may be adversely affected, causing more gas to be burnt than is needed. As you might expect, a vehicle that is using more gasoline than required will not pass the emissions test. These problems can cost several hundred dollars to repair.
3. Rich fuel mixture
Also known as running rich, high amounts of carbon monoxide in your car’s exhaust fumes means that its engine is burning too much gasoline. There are numerous explanations for a rich fuel mixture, including leaky fuel injectors, a bad throttle position sensor, excessive pressure, or a faulty mass airflow sensor. Any one of them will likely set you back a few hundred dollars.
4. Exhaust leak
A leak in your car’s exhaust system can cause all sorts of problems, from reduced fuel efficiency and increased engine noise to pedal vibrations and much dirtier gas fumes. Because the problem throws off the readings of the throttle position sensor, even a small leak can result in a failed inspection. Repair costs for the problem can range from under one hundred to several hundred dollars.
5. Malfunctioning Evaporative Emission Control System
The EVAP in your vehicle is responsible for preventing the release of toxic exhaust fumes into the atmosphere. If there is a leak in the vacuum hoses or vents, a defective purge valve, or even a loose or cracked gas cap, the system will not perform its primary function. Repairing these problems is generally inexpensive since affected components are easy to access.
If you fail your next emissions test, there’s an excellent chance that one of these problems is to blame.