Corolla (Without Cold Advance Option)

Connect a timing light to engine. With engine idling, timing should be about 18° BTDC. Disconnect hose from distributor sub-diaphragm and plug end. Timing should change to 10° BTDC. Stop engine and apply vacuum to both diaphragms and check for proper movement. Reconnect hoses.

Fig 1: Corolla Spark Control (Without Cold Advance)

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