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 MANUALSCHEVROLET1985CHEVY VAN G20, 6.2 C, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEADJUSTMENTTUNE-UP - V6ADJUSTMENTSTHROTTLE POSITION SENSOR (TPS) ADJUSTMENT4.3L (E4ME ONLY)
1985 Chevrolet Chevy Van G20, 6.2 C, Standard
4.3L (E4ME Only)
1985 Chevrolet Chevy Van G20, 6.2 C, StandardSECTION 4.3L (E4ME Only)
- Using a 5/64" (2 mm) drill, drill a 1/16" to 1/8" deep hole in aluminum plug covering TPS adjustment screw. Use care not to damage screw head. See Fig 1 .
- Start a No. 8 1/2" long self-tapping screw in drilled hole, turning screw in only far enough to ensure good thread engagement. Using a screwdriver between screw head and air horn, pry out plug.
- Using tool (J-28696), remove TPS adjustment screw. Connect a digital voltmeter from TPS connector center terminal "B" to bottom terminal "B" to bottom terminal "C". With ignition on, engine stopped, install TPS adjustment screw to obtain specified voltage with A/C off and throttle at idle.
- After adjustment, install new plug in air horn. If new plug not available, use Delco Threadlock Adhesive X-10 on screw threads then adjust voltage, as in step 3). Clear trouble code memory after adjustment.
THROTTLE POSITION SENSOR SPECIFICATIONS
| Application | Volts @ Idle |
|---|---|
| 2.8L E2SE | .26 |
| 4.3L E4ME | .25 |
RENDER: 1.0x
NO RELATED
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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.