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Buick
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1993
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Riviera V6-231 3.8L VIN L SFI
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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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Adjustments
Ignition Timing: Adjustments
This vehicle is equipped with a "Distributorless Ignition System" (DIS). Timing is controlled by the ECM and no adjustment can be made.