Operation CHARM
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Chevy Truck
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1990
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Lumina APV V6-191 3.1L
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Repair and Diagnosis
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Powertrain Management
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Tune-up and Engine Performance Checks
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Ignition Timing
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Specifications
Ignition Timing: Specifications
Ignition Timing
10 Degrees BTDC
Note: Disconnect single wire EST connector (tan w/black stripe) at engine wiring harness, located in front of the shock tower.