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Honda
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1985
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Prelude Base, Standard
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Repair and Diagnosis
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Engine Performance
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System
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Air Cleaner - Thermostatic
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Operation
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Check Valve
Check Valve
This valve acts to prevent vacuum pressure loss during periods of wide-open throttle operation.
Fig 1: Sectional View of Air Intake Control System (Accord & Civic Shown; Prelude Similar)