does any one know if a bad throttle position sensor would cause bad gas milage?

Answer 1

Its highly unlikely; the throttle postiion sensor if bad would cause a hesitation on acceleration and hard shifts but not poor fuel economy

the primary sensors relevant to fuel economy are the oxygen sensor and the mass airflow sensors.

The fuel mixture is based off of the feedback from the oxygen sensor that samples the exhaust for the amount of unburnt fuel and the PCM sends signals to the injectors to adjust the mixture based off of that input. The Mass Airflow Sensor measures the amount of air going into the engine.

the throttle position sensor is an indication of driver demand for acceleration and not a significant contributor to the fuel mixture calculation unless your at wide open throttle or on full deceleration

hope that helps

Answer 2

Absolutely!!!! If the operating computer gets bad signals from your TPS, it might think that your throttle is all the way open and adjust the fuel (dumping) to accommodate. One of the biggest problems with a bad TPS is a premature catalyst failure and premature exhaust system failure. Another big fuel waster is a malfunctioning temperature sensor!!! If the computer thinks that the engine is cold, it continue to supply too much fuel. Have all your sensors checked. Have your computer's trouble codes checked.

Answer 3

Did you check the air cleaner for a mouse nest? A bad water temp sensor for the computer can cause a rich mixture too if it is reading colder then the ambient temperature. Check the plugs to see what color they are after driving at express way speeds to make sure you are running rich.