EXP L4-098 1.6L VIN 2 2-bbl (1983)
Power Valve: Description and Operation
Purpose:
To increase the air/fuel ratio during periods of heavy acceleration or high speed operation.
Operation
The power enrichment system, controlled by intake manifold vacuum, supplies extra fuel during these operating conditions.
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Manifold vacuum is applied to the power valve diaphragm from an opening in the carburetor base where it is connected by passages in the
main body to the diaphragm.
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During idle and light load conditions, high manifold vacuum overcomes the force of the power valve spring and the valve is held closed.
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When the throttle opening is increased and intake manifold vacuum drops, the valve opens and fuel flows from the bowl through the power
valve into the primary main well.
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This extra fuel is then added to the main metering system fuel to provide the increased air/fuel ratio necessary for high speed or heavy load
operation.
