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 MANUALSCHEVROLET1984EL CAMINO V8-305 5.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTHROTTLE POSITION SENSORADJUSTMENTS
1984 Chevrolet EL Camino V8-305 5.0L
Throttle Position Sensor: Adjustments
1984 Chevrolet EL Camino V8-305 5.0LSECTION Adjustments
Fig. 15 Throttle Position Sensor Adjustment Screw Cover Removal:
Fig. 16 Throttle Position Sensor Specifications:
Do not remove plug sealing TPS adjustment or adjust TPS unless carburetor is overhauled or ``Computer Command Control (C3)'' system diagnosis indicates a problem with the switch.
1. Drill a .078 (5/64) inch hole, 1/16-1/8 inch deep, in plug covering TPS adjustment, Fig. 15.
2. Thread a No. 8 sheet metal screw into hole and pry out plug using a suitable lever.
3. Remove TPS adjusting screw using tool J-28696 or equivalent.
4. Leaving electrical connector in place, connect a digital voltmeter between TPS center terminal (B) and bottom terminal (C), using jumper wires if necessary. Only a digital voltmeter with 10 megohm input impedance or higher can be used. Conventional voltmeters do not have sufficient resistance to obtain accurate readings.
5. With ignition on, engine stopped and A/C off, install TPS screw and adjust quickly to obtain specified TPS idle voltage, Fig. 16.
6. Turn ignition off and install new plug over TPS adjusting screw or seal opening with RTV sealer.
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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.