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Yesterday I felt like pokin' around my engine compartment and I ended up testing the egr valve and its vacuum. With the engine running there is very little vac sucking on the egr. Even with the engine at higher rpm there still is not that much. I tried hooking a vac line from the valve straight to an intake outlet (where there is a ton of suction) and it made the engine bog at ide but run ok when I reved it. BTW, it's a 76 280. Also, what is the device inline with the egr vacuum hose. It has 2 wires going to it and when I put 12 volts to it, there was no click or anything. Is this supposed to to let the vacuum flow? I'll go mess around some more and se what I can find. Thanks.
wiskman
 

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Reading from a Chilton manual: "1975-76, the solenoid valve blocks the vacuum to the EGR valve. When the temperature of the engine coolant or in the passenger compartment reaches normal operating temperature, the solenoid is deactivated, then the intake manifold vacuum is allowed to act upon the EGR valve diaphragm and exhaust gas recirculation takes place." A temperature switch in the coolant system should conduct current when the water temperature is below 122 degrees on 1975-76 models and stop conducting current between 134 -145 degrees (for testing purposes).
 
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