Operation CHARM
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Isuzu
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1993
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Pickup 2WD L4-2.3L (4ZD1)
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Repair and Diagnosis
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Powertrain Management
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Ignition System
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Distributor
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Distributor Advance Unit
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Description and Operation
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Vacuum Advance
Vacuum Advance
Distributor - 2.3L:
The vacuum advance controls affect the time at which each
spark plug
fires. The ignition timing control system changes the
ignition timing
in response to ported vacuum.