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Home >> Mitsubishi >> 1990 >> Montero 4WD V6-2972cc 3.0L SOHC >> Repair and Diagnosis >> Powertrain Management >> Ignition System >> Ignition Timing >> Adjustments
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Ignition Timing: Adjustments

IGNITION TIMING ADJUSTMENT

Adjustment conditions:
^ Engine coolant temperature: 85 - 95°C (185 - 205°F)
^ Light, electric, cooling fan and accessories: OFF
^ Transmission: Neutral (N or P for vehicles with an automatic transmission)





(1) Connect a tachometer and a timing light.





(2) If the tachometer used is the primary-current pulse detection type of tachometer, insert a paper clip at the wire side of the connector, and connect the tachometer to it. Insert the paper clip as shown in the illustration. Do not disconnect the connector.





(3) Connect a lead wire with alligator clips to the terminal for ignition-timing adjustment (located in the engine compartment), and ground it.
(4) Start engine and run at curb idle speed.





(5) Aim timing light at crankshaft pulley.
- If flash occurs when timing mark is before specified degree mark, timing is advanced. To adjust, turn distributor housing in direction of rotor rotation.

- If flash occurs when timing mark is after specified degree make, timing is retarded. To adjust, turn distributor housing against direction of rotor rotation.

If timing within specified value, proceed to step (8). If outside specified value, proceed to next step.

Basic ignition timing: 5°BTDC ± 2° at curb idle speed





(6) Loosen distributor mounting nut just enough so the distributor housing can be rotated in its mounting. Turn distributor housing until specified value is reached.
(7) Tighten the mounting nut and recheck timing.
(8) Disconnect the lead wire connected at step (3).
(9) Check to be sure that the idling ignition timing is advanced to the actual ignition timing.

Actual ignition timing: 15°BTDC at curb idle speed

NOTE:
1. The actual ignition timing might fluctuate according to the control mode of the engine control unit. If it does, check the basic ignition timing once again; it is in good condition if there is no fluctuation.
2. The actual ignition timing is caused to advance more, according to the altitude, at an altitude of approximately 700m (2,300 ft.) or more above sea level.

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