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Home >> GMC >> 1993 >> Forward Control 5.7 K, L05, Automatic >> Repair and Diagnosis >> Engine Performance >> Remove, Overhaul & Install >> Engine Controls - Remove/Install/Overhaul >> Fuel System (Gasoline) >> Upper Intake Manifold & CPI Assembly >> Removal
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Upper Intake Manifold & CPI Assembly: Removal

  1. Relieve fuel pressure. See FUEL SYSTEM PRESSURE RELIEF (CPI) under FUEL SYSTEM (GASOLINE). Remove plastic cover on upper intake manifold. Disconnect wiring harness connector to TP sensor, IAC motor, MAP sensor and intake tuning valve assembly.
  2. Disconnect throttle cable, TV linkage and cruise control cable from upper intake manifold. Remove ignition coil, PCV hose and related vacuum hoses. Remove air cleaner snorkel.
  3. Mark location of all studs for proper reassembly. Remove upper intake manifold bolts and stud nuts. Remove upper intake manifold assembly. See Figure.
    NOTE: DO NOT  attempt to disassemble CPI assembly. CPI unit is not serviceable and should be replaced as an assembly.
  4. Remove wiring harness connector at CPI unit. Remove and discard fuel fitting clip. Disconnect fuel inlet and return lines, and fitting assembly. Discard "O" ring seal.
  5. To remove CPI assembly from intake manifold, squeeze poppet nozzle locking tabs together while lifting nozzle out of casing socket from each cylinder. After removing all the poppet nozzles (6), lift CPI assembly out of casing. See Figure.
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