Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY1982COLONY PARK V8-302 5.0L VIN F 2-BBLREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTHROTTLE POSITION SENSORDESCRIPTION AND OPERATION
1982 Mercury Colony Park V8-302 5.0L VIN F 2-bbl
Throttle Position Sensor: Description and Operation
1982 Mercury Colony Park V8-302 5.0L VIN F 2-bblSECTION Description and Operation
Fig. 2 Throttle position sensor (typical):
This sensor, Fig. 2, is basically a rheostat switch attached to the carburetor throttle shaft and responds to throttle valve angle changes. The throttle angles are classified into three operating modes as follows:
a. Closed Throttle (Idle or Deceleration)
b. Part Throttle
c. Wide Open Throttle (Maximum Acceleration)
The ECA applies a reference voltage of about 9 volts to the sensor. The resultant sensor voltage supplied to the ECA, which is determined by the throttle position, is used by the ECA to determine the proper amount of spark advance, EGR flow, air/fuel ratio and thermactor air mode.
The throttle position sensor mounting holes are slotted to permit adjustment. If the sensor is replaced, it must be correctly positioned or incorrect throttle information will be sent to the ECA. The adjustment requires use of special electronic test equipment.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.