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Home >> Chevrolet >> 1987 >> Chevette L4-98 1.6L >> Repair and Diagnosis >> Powertrain Management >> Ignition System >> Distributor >> Distributor Vacuum Control >> Description and Operation >> Vacuum Modulator Check Valve (VM-CV)
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Vacuum Modulator Check Valve (VM-CV)


This valve is used on vehicles equipped with Electronic Fuel Control. The VM-CV is located in the line from the fresh air vent port of the vacuum modulator to the fresh air vent at the carburetor. It is used to make sure fresh air is drawn from the fresh air port at the carburetor and not from the fresh air vent of the vacuum modulator when the CEAB-TVS is open.



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