LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 1989 >> Forward Control 5.7 K, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - TBI >> Removal & Installation >> Throttle Body Assembly >> Removal

Throttle Body Assembly: Removal

  1. Disconnect air cleaner (THERMAC) hose from engine fitting (if equipped). Remove air cleaner, adapter, and gasket. Disconnect electrical leads at IAC valve, throttle position sensor, and fuel injector(s).
  2. Relieve fuel pressure. See FUEL SYSTEM PRESSURE RELIEF. Disconnect fuel lines from throttle body. Discard fuel line "O" rings. Disconnect grommet with wires from throttle body.
    NOTE: On model 220 TBI units, squeeze plastic tabs on injectors and pull 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.