Operation CHARM
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Ford
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1993
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Aerostar 2WD V6-245 4.0L
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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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Compression Check
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Specifications
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Compression Check: Specifications
AllData Editors Note - Ford does not provide a cranking pressure specification, only an acceptable range.
Compression Pressure
PSI of lowest cylinder must be within 75% of highest