Operation CHARM
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Cadillac
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1987
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Cimarron V6-173 2.8L
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Repair and Diagnosis
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Powertrain Management
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Computers and Control Systems
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Testing and Inspection
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Scan Tool Testing and Procedures
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Function Selector Positions
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Knock Retard
Knock Retard
The display indicates the number of degrees the
Electronic Control Module
(ECM)
is retarding the
Electronic Spark Timing
(EST)
.