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What is an EGR vacuum solenoid on a 1991 4.3 s10 and what it does?
Wiki User
∙ 10y ago
The EGR (Exhaust Gas Recirculation) valve opens when vacuum is applied. The EGR vacuum solenoid opens and closes the vacuum supply to the EGR valve when it is commanded to do so by the ECM (Engine Control Module).
Wiki User
∙ 10y ago
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