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Home >> GMC >> 1995 >> Forward Control 4.3 Z, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> Remove, Overhaul & Install >> Engine Controls - Remove/Install/Overhaul - 4.3L >> Fuel System >> 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 . Disconnect negative battery cable. Remove plastic cover on upper intake manifold. Disconnect electrical harness connectors from TP sensor, IAC valve, MAP sensor and intake manifold tuning valve assembly.
  2. Disconnect throttle and cruise control cables 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 injector 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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