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Home >> Nissan-Datsun >> 1985 >> Sentra SE, Automatic >> Repair and Diagnosis >> Engine Performance >> Adjustment >> Tune-Up - 4-CYL >> Adjustments >> Ignition Timing

Ignition Timing

NOTE: Firing order is 1-3-4-2 and rotor is designed with 135° offset to fire both plugs simultaneously. A spark plug switching system turns off 4 spark plugs under load conditions.
  1. Warm engine to normal operating temperature. Turn air conditioning off (if equipped). Place transmission in Neutral (Man. Trans.) or in "D" (Auto. Trans.). On models with power steering, keep wheels in straight ahead position. Adjust idle speed.
  2. On all models except Federal Pulsar NX, Federal Sentra, disconnect and plug distributor vacuum hoses.
  3. Connect timing light to engine. Loosen distributor clamp bolt and turn distributor until specified ignition timing is obtained. Retighten distributor clamp bolt.
IGNITION TIMING (DEGREES BTDC @ RPM)

Application Man. Trans. (1) Auto. Trans.
Pulsar NX
Federal 15°@700-900 8°@550-750
Calif. (2) 5°@700-800 (2) 5°@600-700
Sentra
Federal 15°@700-900 8°@550-750
Calif. (2) 5°@700-800 (2) 5°@600-700
(1) With Auto. Trans. selector in "D" position.
(2) Degrees are ATDC.
Fig 1: Ignition Timing Mark Location
G50J08029
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