Driveability Concerns Due to Throttle Position Sensor Out of Adjustment on Geo Prizm

The Throttle Position Sensor can get out of adjustment due to wear in the throttle body or due to carbon build up. This will cause the idle timing to advance more than 30 degrees which will cause very high HC and NOx emissions. Conversely, the Throttle Position Sensors can wear out and not properly advance the timing which causes a lack of power and poor fuel economy.

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Average mileage: 173,500 (107,000–240,000)
6 model years affected: 1992, 1993, 1994, 1995, more1996, 1997
8 people reported this problem
2 people shared problem details
1995 Geo Prizm107,000
for some unknown reason i have total loss of power even with a full tune up after 40 miles per hour cant maintain speeds on highway slows down going up a slight incline no one can find the issue this could be it
1994 Geo Prizm240,000
Car runs great until about 50-70 miles into trip. Then it starts to lose power when accelerating. Kind of hiccups or jerks if you will. I will replace the TPS ands see how it goes.
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