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 MANUALSCHEVROLET1985NOVA/CHEVY II L4-1600CC 4ALC NUMMIREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTFUEL DELIVERY AND AIR INDUCTIONCARBURETORADJUSTMENTSTHROTTLE POSITION SWITCH
1985 Chevrolet Nova/Chevy II L4-1600cc 4ALC Nummi
Throttle Position Switch
1985 Chevrolet Nova/Chevy II L4-1600cc 4ALC NummiSECTION Throttle Position Switch
1. Connect a suitable tachometer to engine according to manufacturer's instructions.
2. Start and operate engine until coolant reaches normal operating temperature.
3. Disconnect throttle position switch connector, then connect a suitable ohmmeter between throttle position switch connector and ground.
4. Slowly raise engine speed, then check throttle position switch setting speed when ohmmeter shows continuity. Setting speed should be 1600-2000 RPM.
5. Adjust setting speed by turning throttle position switch adjusting screw.
6. Using a suitable ohmmeter, check for continuity between switch terminal and body.
7. If checks are not as indicated, replace switch.
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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.