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 MANUALSCHEVROLET1987NOVA BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMFEEDBACK CARBURETOR CEC SYSTEMSERVICINGCARBURETOR FEEDBACK SYSTEMSYSTEM CHECK
1987 Chevrolet Nova Base, 4D Sedan, Automatic
System Check
1987 Chevrolet Nova Base, 4D Sedan, AutomaticSECTION System Check
- Check TVSV with engine coolant temperature below 45°F (7°C). Disconnect vacuum hose from vacuum switch. Start engine and check that no vacuum is felt in disconnected vacuum hose. Reconnect hose.
- Check EBCV with engine warmed to normal operating temperature. Disconnect EBCV connector. Maintain engine speed at 2500 RPM. Reconnect connector and check that engine speed drops about 300 RPM momentarily.
- Check EBCV with engine warmed to normal operating temperature. Disconnect EBCV connector. Maintain engine speed at 2500 RPM. Reconnect connector and check that engine speed drops about 300 RPM momentarily.
- Check EBCV with engine warmed to normal operating temperature. Disconnect EBCV connector. Maintain engine speed at 2500 RPM. Reconnect connector and check that engine speed drops about 300 RPM momentarily.
- With engine idling, disconnect EBCV connector. Reconnect connector and check that engine speed does not change. Disconnect vacuum hose from vacuum switch.
- Disconnect EBCV connector. Maintain engine speed at 2500 RPM. Reconnect connector and check that engine speed does not change. If no problem is found, system is okay. Otherwise, inspect each part.
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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.