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Corolla (With Cold Advance Option)
- Connect a timing light and start engine. With coolant below 86°F (30°C), disconnect and plug top hose at BVSV. Ignition timing should be about 18° BTDC at idle. Disconnect hose from black side of check valve. Ignition timing should remain at 18° BTDC for at least one minute.
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- Reconnect all hoses and allow engine to warm up. Ignition timing should be 18° BTDC at idle. Disconnect and plug top hose at BVSV. Timing should now be 10° BTDC. Stop engine and apply vacuum to both distributor diaphragms, checking for proper operation.