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Home >> Mercury >> 1976 >> Capri II Base, 2.3L Eng, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Spark Delay Valve System >> Description
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Spark Delay Valve System: Description

The Spark Delay Valve (SDV) system, used on most engines, aids in the control of exhaust emission by delaying vacuum spark advance. The bidirectional valve controls vacuum flow by means of an internal sintered metal disc and check valve combination.

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