Basically, these throttle performance switches change the value that your throttle position sensor gives the ECU. This, in effect, leads your car's computer to believe that it is reaching wide open throttle sooner. How can you do this without buying a throttle performance switch? Just put your foot to the floor faster! No matter what the manufacturer might claim, your car won't make any more power than it did before you installed the switch, you'll just feel it sooner.
The TPS on a 1990 is a WOT switch. Using a multimeter set to read resistance, or a continuity tester, check the resistance between the center and bottom terminals of your TPS with engine off and throttle closed completely. You should read continuity (or zero ohms) between those two terminals, and if you manually open the throttle slightly, the continuity should be lost (resistance goes to infinity). A complete test takes more time; the manual states that with a 0.016" feeler gauge between the throttle lever and the throttle stop screw, you should read continuity, which should go away if you put a 0.027" gauge in there. With the throttle fully open ("WOT"), there should be continuity between the top two terminals of the TPS. In between the idle and WOT positions, there should be no continuity between any of the terminals
no...... ideal open switch should have a resistance of infinity... the question should be a closed switch http://wiki.answers.com/Q/Will_an_open_switch_record_a_resistance_of_zero_ohms" but this is also false because any good conductor will have a small resistance the connecting wire resistance is exhibitted across the terminals of the switch
A Throttle Position Sensor (TPS) reports to the ECM how open the throttle is. The signal is sent as voltage to the ECM, and the amount of voltage reports how open the throttle is. The throttle is what allows gasoline to get to the engine, and in a car that is the gas pedal. We would think fo the value as 0% to 100% and any range between.
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