System Tests: Tercel
- Check BVSV to see that air does not pass through when coolant is below 122°F (50°C). Warm engine and recheck. Air should pass through.
- If testing at high altitude position, ignition timing should be 13° BTDC. Disconnect hose at distributor sub-diaphragm and see that timing changes to 5° BTDC. Reconnect hose, then disconnect from black side of check valve. Plug hose end and see that timing does not change for one minute. Disconnect hose from top of HAC and see that air passes freely into carburetor.
- If testing at low altitude, disconnect and plug vacuum hose from BVSV to HAC and from check valve to sub-diaphragm. Timing should be 5° BTDC. Reconnect hose to sub-diaphragm. Timing should now be 13°BTDC.
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