Ignition Timing

NOTE: DO NOT allow tachometer terminal to become grounded. This can damage igniter and/or coil.

Warm engine to normal operating temperature. Connect timing light to engine. Connect tachometer test lead to "IG (-)" terminal of engine check connector. See Fig 1 and Fig 2.
Short terminals of engine check connector with jumper wire to fix idle speed and timing. See Fig 3 and Fig 4. Ensure transmission is in Neutral and idle speed is correct. Check/adjust base ignition timing. Remove jumper wire and check advance ignition timing.

Fig 1: Tachometer Hook-Up (Cressida & Supra)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Tachometer Hook-Up (Land Cruiser)

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IGNITION TIMING (Degrees BTDC @ RPM)

Fig 3: Ignition Timing Adjustment (Cressida & Supra)

Fig 4: Ignition Timing Adjustment (Land Cruiser)