B3000 SE Cab Plus 4 4WD V6-3.0L OHV (2000)
EGR Tube: Description and Operation
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Provides the flow path for exhaust gases to the EGR valve.
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Exhaust gas flowing through the EGR valve must first pass through the EGR metering orifice. With one side of the orifice exposed to exhaust back
pressure and the other to the intake manifold, a pressure drop is created across the orifice whenever there is EGR flow. When the EGR valve
closes, there is no longer flow across the metering orifice and pressure on both sides of the orifice is the same.
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The PCM constantly targets a desired pressure drop across the metering orifice to achieve the desired EGR flow.
