Operation CHARM
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Mercury
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1983
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Zephyr L4-140 2.3L SOHC
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Repair and Diagnosis
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Engine, Cooling and Exhaust
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Engine
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Tune-up and Engine Performance Checks
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Ignition Timing
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Testing and Inspection
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Steps 19 Through 20
Steps 19 Through 20
Spark Timing, Steps 19 thru 20: