Ignition Timing

CAUTION: Some tachometers may not be compatible with ignition system. Consult tachometer manufacturer before connecting tachometer to system. DO NOT allow tachometer terminal to become grounded to avoid possible damage to ignitor and/or coil.

Ensure engine is at normal operating temperature. Connect timing light to engine. Connect tachometer to proper location. See Fig 1, Fig 2 and Fig 3.
Install jumper wire between proper terminals of engine check connector. See Fig 4, Fig 5 and Fig 6. Ensure that the idle speed is within specification. See IDLE SPEED SPECIFICATIONS table. Ensure base timing is within specification. See 6-CYLINDER IGNITION TIMING (Degrees BTDC @ RPM) table. Adjust timing by turning distributor.
Remove jumper wire from engine check connector and ensure advance timing is within specification. See 6-CYLINDER IGNITION TIMING (Degrees BTDC @ RPM) table.

6-CYLINDER IGNITION TIMING (Degrees BTDC @ RPM)

Application/ Model	Base Timing Degrees @ RPM	Advance Timing Degrees @ Idle
Cressida	10 @ 700	9-11
Supra
Non-Turbo	10 @ 700	9-10
Turbo	10 @ 650	More than 12
Land Cruiser	7 @ 650	12

Fig 1: Installing Tachometer (Cressida)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Installing Tachometer (Land Cruiser)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 3: Installing Tachometer (Supra)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 4: Installing Engine Check Connector Jumper Wire (Cressida)

Fig 5: Installing Engine Check Connector Jumper Wire (Land Cruiser)

Fig 6: Installing Engine Check Connector Jumper Wire (Supra)