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 MANUALSCHEVROLET1987SUBURBAN 1/2 TON 2WD V8-379 6.2L DSLREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTHROTTLE POSITION SWITCHADJUSTMENTS
1987 Chevrolet Suburban 1/2 Ton 2WD V8-379 6.2L DSL
Throttle Position Switch: Adjustments
1987 Chevrolet Suburban 1/2 Ton 2WD V8-379 6.2L DSLSECTION Adjustments
Fig. 56 Throttle position switch adjustment. V8-379 engines with light duty emissions 1983-87 except Calif.:
V8-379 DIESEL ENGINE
1983-87 Except Calif.
1. Disconnect electrical connector to TPS switch and loosen switch mounting screws.
2. Connect ohmmeter between pink (feed) and yellow (EGR solenoid) wire terminals in switch connector.
3. Position 0.646 inch (switch closed) gauge block on Wide Open Throttle (WOT) stop boss on injection pump, Fig. 56, and open throttle until WOT stop screw contacts boss.
4. Hold throttle position, rotate TPS switch until ohmmeter indicates continuity, then torque switch mounting screws to 53 inch lbs.
5. Remove switch, close gauge block and position 0.668 inch (switch open) gauge block between WOT stop screw and stop boss on pump. Ohmmeter should indicate infinite resistance.
6. If ohmmeter indicates continuity with switch open gauge block installed, repeat adjustment procedure until meter indicates no continuity with switch open gauge block between stop screw and boss and continuity with switch closed block between stop.
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.