Question about GMC K1500
For 1998 GMC Truck K1500 1/2ton
Sub 4WD 5.7L SFI 8cyl, check this procedure for 5.0 and 5.7L Engines 1996-98 MODELS...
The 5.0L and 5.7L engines use a two-piece intake manifold design. The upper portion is made from a composite material and lower portion is cast-aluminum. The throttle body attaches to the upper manifold. The lower manifold has an Exhaust Gas Recirculation (EGR) port cast into the manifold for mixture of exhaust gases with the fuel and air mixture. The EGR valve bolts to the lower intake manifold.
The Central Sequential Multiport Fuel Injection (CSFI) system uses multiple injectors to meter and distribute fuel to each engine cylinder. The CSFI unit is retained by a bracket bolted to the lower intake manifold. The fuel meter body also houses the pressure regulator. Metal inlet and outlet fuel lines and nylon delivery tubes connect to the CSFI unit. 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.
Note that the lower intake manifold gaskets are NOT reusable on the 5.0L and 5.7L engines.
CAUTION Fuel injection systems remain under pressure, even after the engine has been turned OFF. The fuel system pressure must be relieved before disconnecting any fuel lines. Failure to do so may result in fire and/or personal injury.
Hope this help.
Posted on May 20, 2010
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Posted on Jan 02, 2017
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