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Precondition the engine as follows:Engine coolant temperature at 85-95°C (185-205°F). Lights, electric cooling fan, and all electrical accessories off. Transmission in neutral or park. Steering wheel in the neutral position. Connecting A Tachometer Install a paper clip into the tachometer check connector. Connect a tachometer to the clip.Ignition Timing Adjustment Connector
With the engine off, ground the ignition timing adjustment terminal with a jumper lead (routed at the top of the firewall). Start the engine and allow it to run at curb idle speed.Ignition Timing Inspection
Connect a timing light to the #1 spark plug wire (front) and check the timing. Basic Ignition Timing 5°±2°BTDC.Adjusting Timing
If necessary loosen the distributor mounting nut and adjust timing by rotating the distributor. Stop the engine. Disconnect the ignition timing jumper wire and re-start the engine. Recheck the timing. Actual Ignition Timing 8°±2°BTDC. Actual ignition timing may vary slightly under the direction of the ECU. If necessary re-check Basic Ignition Timing. If basic ignition timing is correct then no further action is necessary.