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Discussion Starter #1
i have a 94 4.3 cpi and under the vortec cover there is that big round sensor held on by 2 torx screws... anyone know what this is?
 

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"factory freak"...
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8,601 Posts
thats not a sensor, its a "tuning valve". its used to open and close a hole in the plenum to help the engine produce better power at both low and higher engine speeds, depending on wheter the valve is opened or closed.
it is controlled the the computer.
 
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