Operation CHARM
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1982
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Spirit L6-258 4.2L VIN C 2-bbl
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Repair and Diagnosis
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Powertrain Management
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Emission Control Systems
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Exhaust Gas Recirculation
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EGR Temperature Sensor
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Description and Operation
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High Temperature Vacuum Signal Modulator
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High Temperature Vacuum Signal Modulator
OPERATION
The modulator opens when the underhood air temperature reaches 115° F and causes a weakened vacuum signal to the EGR valve. As a result, the amount of exhaust gas being recirculated is decreased.