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Throttle Position Sensor 1990 5S-FE
I am having an RPM problem with my Celica. The RPM's run up and down from about 1300 to 2200 and then drop to about 1800 and stay there pretty much without my foot on the accelerator after the engine is warmed up while driving. I did the obvious and disconnected the throttle position sensor and the engine ran normally when I took the car out for a test drive. My question is why does the engine run normally without the sensor connected? Doesn't the sensor always control the throttle position? Also, if the sensor is bad wouldn't the engine check light come on?
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