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Home >> Isuzu >> 1989 >> Impulse L4-2.3L (4ZD1) >> Repair and Diagnosis >> Powertrain Management >> Ignition System >> Ignition Timing >> Adjustments
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Ignition Timing: Adjustments



Adjust ignition timing under these engine conditions:

1. Engine idling at correct speed and normal operating temperature.
2. Lights, A/C, engine cooling fan, and all accessories turned off.
3. Air cleaner installed.

Timing procedure:

1. Connect timing light.
2. Loosen distributor mounting bolt.
3. Adjust timing to specification:
12° BTDC @ 900 rpm.
4. Tighten distributor mounting bolt.
5. Recheck timing, repeat adjustment if necessary.