1985 Chevrolet Nova Base, AutomaticFACTORY OEM SERVICE PROCEDURE

System Check

  1. 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.
  2. 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.
  3. 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.
  4. 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.
  5. With engine idling, disconnect EBCV connector. Reconnect connector and check that engine speed does not change. Disconnect vacuum hose from vacuum switch.
  6. 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.
Factory Service Tools

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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.

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