G 1500 1/2 Ton Van V6-4.3L VIN W (1997)
Intake Manifold: Description and Operation
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The intake manifold is a two-piece design. The upper portion is made from a composite material and the lower portion is cast aluminum.
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The throttle body attaches to the upper manifold.
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The lower manifold has an exhaust gas recirculation (EGR) port cast into the manifold for mixture. The EGR valve bolts into the lower intake
manifold.
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The Central Sequential Multiport Fuel injection (SFI) system uses multiple injectors to meter and distribute fuel to each engine cylinder. The
Central SFI is retained by a bracket bolted to the lower intake manifold.
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The fuel meter body also houses the pressure regulator. Metal inlet and outlet fuel lines and nylon delivery tubes connect to the Central SFI unit.
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The delivery tubes independently distribute fuel to each cylinder through nozzles located at the port entrance of each manifold runner where the
fuel is atomized.
