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 MANUALSCHEVROLET1986G 20 VAN V8-379 6.2L DSLREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTHROTTLE POSITION SENSORADJUSTMENTS
1986 Chevrolet G 20 Van V8-379 6.2L DSL
Throttle Position Sensor: Adjustments
1986 Chevrolet G 20 Van V8-379 6.2L DSLSECTION Adjustments
Fig. 40 Throttle position switch adjustment 1982 all & 1983---87 with light duty emissions:
Fig. 41 Throttle position switch adjustment 1983---87 with heavy duty emissions:
1. Place throttle position switch on fuel injector pump with throttle lever in closed position. Throttle position switch should be attached snugly. Do not tighten.
2. Attach continuity meter across terminals or wires as shown, Figs. 40 and 41.
3. Turn stop screw on throttle shaft to wide open position and insert ``switch closed'' gage block between gage boss on injection pump and stop screw.
4. Rotate and hold throttle lever against gage block.
5. Rotate throttle switch clockwise (facing throttle switch) until continuity just occurs across terminals or wires. Hold switch body in this position and tighten mounting screws. Switch point must be set only while rotating switch body in clockwise direction.
6. Check by allowing throttle lever to return to idle position. Remove ``switch closed'' gage bar and install ``switch open'' gage bar. Rotate throttle lever against it. There should be no continuity between terminals or wires.
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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.