SAFETY FIRST: Protective gloves and eyewear are recommended at this point.
Throttle Position Sensor (TPS)
Remove the carburetor. See the Carburetor Removal topic for more information.
Disconnect the three pin black plastic coupler that connects the TPS to the main wiring harness.
Using a digital multimeter set to Ohms of resistance, measure the resistance between the blue wire and the black wire, using the half of the coupler that leads to the TPS on the carburetor body. Compare your reading with specification. If your reading is not within specification, replace the TPS.
(Specification for TPS resistance between the blue wire and the black wire is 4k to 6k Ohms)
Measure the resistance between the yellow wire and the blue wire as you open and close the throttle. Resistance should increase when going from fully closed to fully open position. Resistance should decrease when going from fully open to fully closed position. Replace the TPS if it does not function properly.
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