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Ignition Timing

  1. Engine must be at operating temperature. Connect timing light to engine. Connect tachometer to negative terminal of coil, engine check connector, or remove rubber cap and connect probe to service connector on distributor (if equipped). For CARBURETED models, see Fig 3. For EFI models, see Fig 4.
    CAUTION: Some tachometers may not be compatible with ignition system. Consult tachometer manufacturer before connecting tach to system. Do not allow tachometer terminal to become grounded. This can damage igniter and/or coil.
  2. Adjust idle speed to specifications. Install jumper wire across terminals of engine check connector (if equipped).
  3. On Tercel and RWD Corolla, disconnect and plug inboard distributor vacuum hose only. On all other models, disconnect and plug both distributor vacuum hoses. Adjust timing by turning distributor.
Fig 1: Corolla (EFI) Ignition Timing Adjustment
G61171Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: MR2 Ignition Timing Adjustment
G61204Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
IGNITION TIMING (DEGREES BTDC @ RPM)

Application Timing: Vac. Plugged Timing: Vac. Connected
Corolla (Carb.) 5 @ 950 (1) 13 @ 950
Corolla (EFI), MR2 10 @ 950 (2) N/A
Tercel 5 @ 950 13 @ Idle
(1) No specification available for FWD Corolla.
(2) With engine check connector shorted.
Fig 3: Carb Tach Hook-Up For Idle Speed & Timing Adjustments
G61175Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 4: EFI Tach Hook-Up For Idle Speed & Timing Adjustments
G61174Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 5: Ignition Timing Marks
G46452Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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