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.
Driveability Concerns Due to Throttle Position Sensor Out of Adjustment on Toyota Paseo
Average mileage: 157,500 (104,000–253,000)
12 people reported this problem
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1994 Toyota Paseo 253,000 mi, Visitor
Gas mileage went from 320 per tank to less than 200 Replace TPS, reset check engine light