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Home >> GMC >> 1991 >> Forward Control 4.3 Z, Automatic >> Repair and Diagnosis >> Engine Performance >> Remove, Overhaul & Install >> Engine Controls - Remove/Install/Overhaul >> Fuel System (TBI) >> Throttle Body >> Removal

Throttle Body: Removal

  1. Disconnect air cleaner (THERMAC) hose from engine vacuum fitting (if equipped). Remove air cleaner, adapter, and gasket. Relieve fuel pressure. See FUEL SYSTEM PRESSURE RELIEF under FUEL SYSTEM (TBI).
  2. Disconnect electrical leads at IAC valve, throttle position sensor, and fuel injector(s). Disconnect fuel lines from throttle body. Discard fuel line "O" rings. Disconnect grommet with wires from throttle body.
    NOTE: On TBI model 220, squeeze plastic tabs on injectors and pull connector straight up.
  3. Disconnect throttle linkage, return spring and cruise control linkage (if equipped). Label and disconnect all vacuum hoses from throttle body. Remove throttle body mount bolts/nut. Remove throttle body.
NOTE: Disassembling throttle body unit for immersion in cleaning solvent requires removal of throttle body cover or fuel meter assembly, TPS and IAC assembly. Throttle valve screws are staked in position and should NOT be removed.
WARNING: Pressure regulator spring is under heavy tension, and may cause personal injury if released. DO NOT immerse cover in any type of cleaning solvent.
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