TSRM/MK4 Supra/Repair Manual
Repair ManualWiring Diagrams
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EM/Engine Mechanical19 / 139
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ENGINE — ENGINE MECHANICAL — MK4 Supra Engine Mechanical, page 19
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EG–19 ENGINE – ENGINE MECHANICAL 3. CHECK IDLE SPEED (a) Race the engine speed at 2,500 rpm for approx. 90 seconds. (b) Check the idle speed. Idle speed: 700 ± 50 rpm 4. ADJUST IGNITION TIMING (a) Using SST, connect terminals TE1 and E1 of the DLC 1. SST 09843–18020 SST TE1 E1 DLC1 P11288 (b) Using a timing light, check the ignition timing. Ignition timing: 10 ± 2° BTDC @ idle (Transmission in neutral position) P12353 (c) Loosen the nut, and adjust by turning the distributor. Ignition timing: 10° BTDC @ idle (Transmission in neutral position) (d) Tighten the nut, and recheck the ignition timing. Torque: 19 N·m (195 kgf·cm, 14 ft·lbf) (e) Remove the SST from the DLC1. SST 09843–18020 Turn P10609 5. FURTHER CHECK IGNITION TIMING Ignition timing: 7–19° BTDC @ idle (Transmission in neutral position) HINT: The timing mark moves in a range between 7° and 19°. 6. DISCONNECT TACHOMETER AND TIMING LIGHT