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Home >> Mazda >> 1976 >> RX-4 4D Sedan, Automatic Trans >> Repair and Diagnosis >> Engine Mechanical >> Fuel System >> HITACHI 4-Barrel Carburetors >> On Vehicle Adjustments >> Choke Delay Valve >> California Models
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California Models

Warm up engine to normal operating temperature. Stop engine and remove air cleaner assembly. Disconnect vacuum sensing tube from choke diaphragm. Start engine and run at idle speed. Diaphragm shaft should move fully inward within 10-20 seconds after reconnecting vacuum sensing tube to choke diaphragm.

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